Champ Scorpion Stinger Tri-Lok Fits all Foot Joy golf shoes w/ Fast Twist or Tri-Lok fastener system. Refer to Champ Fitting Guide at http://champspikes.com/products/golf/ Soft durometer TPU for superior comfort and durability Green-friendly design minimizes marks on the green Wrench holes formed in rigid material, Primary spring-flex traction elements provide optimum gripping ability "C" visible wear indicator turns solid when spikes need to be replaced