By ED TRAVIS
Three Quantum iron models are being introduced by Callaway Golf for 2026, each uses a new and unique head construction called the Modern 360° Undercut Cavity.
Fast Facts
Callaway Quantum Max Irons
Game-improvement category
Hollow head filled with urethane microspheres
Moderate offset
AI designed
Modern 360° Undercut
Progressive tri-level sole
Stock lofts: 5-iron 22°, pitching wedge 42°
Stock shafts: KBS Max 90, True Temper Denali, Mitsubishi Vanquish & Eldo
Stock Grip: Golf Pride Tour Velvet
Pre-order: Jan. 16, 2026
At retail: Feb. 27, 2026
7-piece set: $1149.99 steel, $1249.99 graphite
Callaway Quantum Max OS Irons
Super game-improvement category
Hollow over-size head filled with urethane microspheres
Large offset
AI designed
Modern 360° Undercut
Progressive tri-level sole
Stock lofts: 5-iron 22°, pitching wedge 42°
Stock shafts: True Temper Elevate & Denali, Mitsubishi Vanquish
Stock Grip: Lamkin Crossline 360 & ST Soft
Pre-order: Jan. 16, 2026
At retail: Feb. 27, 2026
7-piece set: $1149.99 steel, $1249.99 graphite
Callaway Quantum Max Fast Irons
Super game-improvement category
Hollow over-size lightweight head filled with urethane microspheres
Large offset
AI designed
Modern 360° Undercut
Progressive tri-level sole
Stock lofts: 5-iron 22°, pitching wedge 42°
Stock shafts: Mitsubishi Vanquish & Eldo
Stock Grip: Lamkin Crossline 360 & ST Soft
Pre-order: Jan. 16, 2026
At retail: Feb. 27, 2026
7-piece set: $1349.99 graphite only
WYNTK
The focus for the design of Quantum irons was not on ball speed and distance although that’s important but on hitting greens by increasing forgiveness across the entire face. Recreational golfers miss the center of the iron face toughly 80% of the time, usually low and often towards the toe. Quantum is a return to irons stressing forgiveness with large cavity backs and oversize profile, compensating for this common miss.
Callaway has come up with the Modern 360 Undercut cavity, a two-piece construction. The hosel and face are cast as one-piece and welded to the back of the iron rather than the face being welded to the iron body and hosel as is usually done. This way of building the clubhead places the weld line much further from the face and it runs all the way around which increases the amount of sole flexing at impact.
Better flexing produces more consistency, ball speed and forgiveness across the entire face, especially low on the face where a large portion of +12 handicap players make contact.
The bottom of the club also received an update called Tri-Sole with a loft-dependent progressive leading-edge camber plus a wider and deeper sole giving better turf interaction.
