proto-c

"The QUATTRO FORGED FACE"
with 4 technologies combined
Four proprietary technologies are incorporated into a single cup face to expand area with stable and high rebound. The driver delivers a pleasant feel and powerful performance, all while providing bounce and capturing the ball.
<Forging with heat compression>
- Enhanced face strength -
“Forging with heat compression” is PROTO-CONCEPT’s patented technology for forging from round titanium rods. By generating a “forged line” of titanium, which cannot be achieved by ordinary pressing methods, and by increasing the compression rate in the center of the face, the structure is forged more precisely, creating an unprecedented feel and resilience.
<Forging with optimal thickness deviation>
- Expanded sweet spot -
The thickness deviation is appropriately structured to ensure a uniform CT across the face. Thinner at the peripheral areas and thicker near the center, rebound performance just barely within the rules is achieved over a wide area of the face.
<Dimple forging>
- Enhanced face strength -
The dimple forging process in which the forging is partially pressed further improves strength near the face center and stabilizes rebound performance.
<Power groove forging>
- Expanded sweet spot -
This technology enhances mis-hit forgiveness by creating grooves in the direction of the face that tends to deviate from the sweet spot, giving directionality to the face deflection.
A true forged cup face
crafted with round rod forging.
<C01D QUATTRO FORGED FACE>

Forging with heat compression (*patented technology) presses round titanium rods that have been swelled to a large diameter by heating, pressurizing and compressing the central area. The flow of thickness is calculated and the temperature is controlled at each step of the forging process.

This proprietary round rod forging process results in dense structuring and “forged flow lines.” With stable thickness and form, rebound performance just barely within the rules is achieved over a wide area of the face.

<Conventional forged faces>

Conventional forged faces are manufactured by pressing flat titanium plates. Since titanium does not deform plastically, it is necessary to create a space on the face side to allow thickness to escape. The portions that protrude from the face surface are dropped and finished by the polishing process, which often cause variations in thickness, CT and form.

Many drivers today do not have cup faces, and instead made by welding forged face material, which may also cause unevenness. For this reason, drivers commonly margin the repulsion coefficient to be slightly lower than the rules to avoid excessive rebound.

Smash Balance
that creates ease of swing and powerful drive
The shallow back, deep, low center of gravity head that currently features mainstream drivers has evolved to achieve a high moment of inertia and high launch, while being softer in terms of physical characteristics. However, as a tool used by humans, this is not necessarily easy to swing. Even professional golfers often struggle mastering its use.
The C01D’s unique Smash Balance center of gravity design maintains a high moment of inertia while providing ease of swing and maneuverability, making it easier for golfers to drive trajectories they envision. The trajectories created by the thick impact are powerful line drives, practical and defying head winds.
Loft Head Weight CG Height CG Depth CG Length CG Angle MOI
9.5 201g 35.3mm 36mm 35mm 26mm 4591cm2
10.5 201g 35.2mm 36.4mm 35.3mm 25.8mm 4530cm2
11.5 201g 35.2mm 36.4mm 34.8mm 25.6mm 4579cm2