Sports
Callaway’s protoype Quantum TD-TD driver makes a big debut
Welcome to Fully Equipped’s weekly Tour equipment report. Each Friday of PGA Tour weeks (plus other times, if news warrants), GOLF equipment editor Jack Hirsh will run you through some of the biggest news surrounding golf clubs on Tour, including changes, tweaks and launches.
Callaway’s Quantum Mini driver and Ti fairway wood weren’t the company’s only prototype heads to make noise on the PGA Tour this week.
While the presumed next iterations of Callaway’s mini driver and titanium fairway woods surfaced on Tour, it was the Quantum TD-TD driver head that actually went in play, getting conversions from both Min Woo Lee and Kevin Yu.
Lee raised eyebrows last year when the long-hitting Aussie switched into the Elyte Triple Diamond Tour Draw head and immediately saw an uptick in driving accuracy, finishing tied for first in the category at the FedEx Open de France. This year, in two starts, his driving accuracy percentage is six points higher than in 2025.
He loved the smaller profile of the Triple Diamond TD head, and the reduced face progression (more offset) helped him get a more neutral start line than the standard Triple Diamond, making it easier for him to hit his favored pull cut off the tee.
But he still didn’t feel like he had his “bomb it” swing and was living at the higher end of spin windows, between 2,400 and 3,000 RPMs, according to Callaway Tour Rep Kellen Watson.
Min Woo Lee hits fades, so why is he using a ‘Draw’ driver head? | Tour Report
But in testing the new Quantum TD-TD — which hit the USGA conforming list last fall with some of the other Quantum heads — this week, Watson and Lee found a shaft change from the OG Fujikura Ventus Blue 7-X to the new Ventus Black 7-X with VeloCore+ not only brought that high spin threshold down about 300 rpms, but also tightened his delta to 2,300 to 2,700.
“Shape suited his eye very well and all the numbers were similar, but mainly the ‘all-out’ drive had a much better start line, spin rate and down-range pattern. Allowing Min to take full advantage of his length is a huge boost for his chances every week.” Watson told GOLF. “About 12 shots on the range and nine holes of practice on a very windy day at Pebble were enough to get his stamp of approval.”
Lee gained .648 strokes off the tee in Round 1 at Spyglass Hill in a round of 67 and had hit 19 of his first 25 fairways as he finished up his second round on Friday.
Callaway Quantum Triple Diamond Custom Driver
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ALSO AVAILABLE AT: PGA Tour Superstore, Callaway
Min Woo Lee’s new driver specs
Callaway Quantum TD-TD
Loft: 10.5 degrees @ 10.6 degrees
OptiFit Setting: N/S
Shaft: Fujikura Ventus Black VeloCore+ 7-X
Length: 45″ EOG
Tipping: 1/2″
Grip: Gripmaster Leather (3 Double Sided wraps + 1 DS on RH)
Meanwhile, Yu, who prefers a push draw to Lee’s fade, also found success with the Quantum TD-TD. Yu previously played the Elyte Triple Diamond Max and the Paradym Ai-Smoke Triple Diamond Max.
But the new Quantum Triple Diamond Max is a little different than the previous iterations, Watson said.
“He was trying to change swing mechanics to compensate for the small differences,” Watson explained. “In the load of testing we had done with all of our staff, we were quick to find out that the TD-TD was a great option for previous TD Max users who wanted to work the ball both ways.”
Thanks to the more neutral start line, Yu actually found he could work in a slight fade to his arsenal, a valuable weapon around a tight track like Pebble Beach.
“In the grand scheme of things, the footprint difference between the TD-TD and TD Max is minute,” Watson said. “Kevin didn’t have any apprehension between the two shapes, especially after the first few shots with TD-TD. Ball speed, spin rates and launch dynamics were unchanged after the previous models, allowing Kevin to seamlessly transition with a new shot shape to take advantage of.”
Yu hit 11 of 14 fairways at Pebble Beach in Round 1 and gained nearly .8 strokes off the tee.
Callaway Quantum Triple Diamond Max Custom Driver
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Kevin Yu’s new driver specs
Callaway Quantum TD-TD
Loft: 9.0 degrees @ 9.9 degrees
OptiFit Setting: N/S
Shaft: Graphite Design Tour AD-VF 6-X
Length: 45.5″ EOG
Tipping: 1″
Overall, it was a big week for Quantum as Lee’s switch meant eight of the 10 Callaway staffers in the field — and 10 percent of the field — were playing a Quantum driver at Pebble.
Lee adds a versatile weapon
For someone who has 170 mph ball speed with a 2-iron, Pebble Beach would seem like an obvious track to gear back with iron off the tee, but Lee actually took the club he once called his “secret weapon” out of the bag this week.
Last week at the WM Phoenix Open, Lee added a new 21 degree Apex Utility Wood to the bag and he’s kept this week despite the windy conditions at Pebble Beach.
“The problem in the past for me is I spun the hybrid way too much,” Lee told Callaway’s Johnny Thompson. “This one keeps the spin down, which is nice, but it still has the height, which is what you want into par-5s and into tee shots.”
The club could actually be a more long-term replacement for Lee as Watson said the club was the best option at three windows: a stinger, stock and high ball. The stinger had the same ball speed and carry that Lee gets with his utility iron, but he also got the best landing angle when he tried to hit a high ball.
Callaway 2025 Apex Custom Utility Wood
The Apex UW is designed for serious, avid golfers seeking the perfect blend of a fairway wood’s power and a hybrid’s versatility. Engineered with Tour feedback and loaded with performance technologies, it delivers a higher, more neutral ball flight with the control all players demand.
TUNGSTEN SPEED WAVE
A dynamic, 41g+ tungsten wave structure positions mass low and forward, enhancing ball speed and launch—particularly on low-face strikes where players tend to lose distance.
STEP SOLE DESIGN
A redesigned sole with a stepped geometry reduces turf interaction, helping to maintain swing speed through impact and promoting more consistent contact across different lies.
TRIAXIAL CARBON CROWN
The lightweight carbon construction allows for strategic weight redistribution, creating a more forgiving clubhead while refining launch and spin for greater shot-making control.
TOUR-INSPIRED SHAPING
Designed with input from the world’s best, the compact, refined shape and neutral face angle inspire confidence at address and deliver workability from tee to turf.
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ALSO AVAILABLE AT: PGA Tour Superstore, Callaway
Three major Odyssey swaps
In more Callaway news, in what was otherwise a quiet week with a smaller field and a huge purse at stake, Lee wasn’t done with gear changes, making a swap at putter, too.
He had been using a prototype black and white Odyssey S2S Jailbird, but this week, he’s switched to a new Odyssey prototype putter.
From photos, we can tell the putter has four movable weights on the sole, presumably to dial in CG. Odyssey’s Cody Hale said Lee was seeking a change to something that better matches his in-to-out stroke path and had a touch more face rotation.
Sepp Straka moved away from his Odyssey Stroke Lab Tuttle for a similar reason, picking up a White Hot OG Rossie with a slant neck to add some face rotation, too.
Meanwhile, Keegan Bradley also moved into an Ai-Dual 1/2 Ball Jailbird Cruiser that matched the specs of his previous Ai-One Jailbird Cruiser, but with three dots milled into the 1/2 ball.
Odyssey Ai-DUAL 1/2 Ball Jailbird DB Cruiser Custom Putter
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ALSO AVAILABLE AT: PGA Tour Superstore, Odyssey
Check this out
This section is dedicated to cool photos we’ve snapped recently on Tour, but haven’t had a reason to share yet. For this week, check out Neal Shipley’s Ping Mini Driver Prototype.
Odds and Ends
Some other gear changes and notes we’re tracking this week.
Rory McIlroy returned to his RORS PROTO blades. … Marco Penge switched into PXG’s Tour-only Lightning Tour Max driver, the same driver Eric Cole is using, highlighting a trend we started tracking a few weeks ago with Max Homa’s switch to the Cobra OPTM LS-K prototype driver. … Wyndham Clark went back to a Titleist TSR3 driver after using a Ping G430 LST his past few starts. … Ryo Hisatsune switched from a Vokey SM11 K*-grind to a .08M in his 60-degree. … Harry Hall switched from a TaylorMade Qi4D LS driver to a Titleist GT3 and upgraded his wedges from Vokey’s SM10 to SM11. … Robert MacIntyre added a TaylorMade Qi4D 5-wood in place of his Stealth 2 Rescue. … Sepp Straka and Michael Thorbjornsen both added 21 degree Qi4D 7-woods, with Straka replacing a three-year-old Callaway Paradym 7-wood. … There were 71 TaylorMade fairway woods in play with 21 Qi4Ds out of the 80-player field.
3 things you should read/watch
A selection of GOLF content from the past week that may interest you.
Rory McIlroy makes surprising gear switch before PGA Tour season debut. The biggest gear news of the week was that Rory McIlroy’s experiment with P7CB cavity-backs was over. But was that really the end or just the beginning?
TaylorMade P7CB Custom Irons
BEST-IN CLASS FEEL
Using Tour feedback and modal analysis we’ve strategically designed mass placement for best in class feel. Crafted using Compact Grain Forging and 2000 tons of pressure to deliver the purest feeling 1025 soft carbon steel possible.
PRECISE CONTROL
Precise milled face and grooves combined with a constant CG the P•7CB is designed to deliver an optimal launch and spin combination for the ultimate control and precision.
CONSISTENCY
Created to maximize accuracy and consistency. The P•7CB optimized perimeter weighting and co-forged tungsten designed to deliver a beautiful blend of stability and workability.
COMPACT TOUR SHAPING
Every aspect of shaping in this iron was intended to meet the needs of discerning ball strikers. A compact blade length and thin topline create a confident, clean look in the playing position while the sole camber and progressive bounce profile provide consistent turf interaction.
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Wedge gapping EXPLAINED with Vokey Wedge Rep Aaron Dill. In Part 2 of our wedge fitting series with Vokey’s Aaron Dill, Johnny Wunder gets his new SM11 wedge set gapped out by Vokey’s resident Tour fitter.
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How 5 days of club fittings changed my mind on golf equipment | Fully Fit 2026. Senior writer Sean Zak explains what is was like to be embedded with us gear degenerates for a week and a half, getting fit for more golf clubs than he could imagine during Fully Fit 2026.
T150 Irons are crafted for added distance with unwavering accuracy. Forged into a player’s shape with progressive blade lengths, T150 offers a precise blend of speed, stability, and consistency—providing the confidence to hit and hold greens from anywhere. 
Titleist 2025 T150 Custom Irons
Confidence-Inspiring Forged Design
Forged into a player’s shape with a slightly larger head size for pure feel with extra stability.
Elevated Ball Speed
1° stronger lofts (vs. T100) combine with an improved muscle channel through 7-iron and lower long-iron CG to help improve speed, launch, and carry.
Superior Flight and Stability
Split high-density tungsten produces optimal CG with remarkable stability for precise shotmaking.
Consistent Speed & Spin
New VFT technology and progressive groove design provide consistent spin and speed across the face in variable conditions.
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The author welcomes your comments at Jack.Hirsh@golf.com.
Want to overhaul your bag in 2026? Find a club-fitting location near you at True Spec Golf.
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