STM S-1 SERIES PROTO STANDARD GRIPS
"Different hardness two-layer structure" that changes flight.
Two layers of different hardness changes the common sense of grip.
Hardening the 399 star-shaped base of the first layer reduces twist at impact.
The star base is also effective in reducing slippage.
By softening the surface of the second layer, a fit that will stick to your hand is achieved. The star-shaped base and the soft surface make it difficult to twist and slip, and has a fit. As it is an elastomer resin, it is strong against rain and sweat, and even if it gets wet, it can be wiped to its original performance.
Obtained patent and utility model.