The Champ Stinger Q-Lok golf spikes are the product of years of research and feedback from thousands of professional and amateur golfers. The spikes are made from soft durometer TPU for superior comfort and durability and uses a C visible wear indication that turns solid to let you know when they need to be replaced. The primary spring-flex traction element provide optimum ground grip but also have a green-friendly design that minimizes marks on the green. The Stinger Q-Lok spikes are easy to clean, non-clogging and have wrench holes for easy application.