Built for comfort with 6 flexible anticlogging comfort legs. However, traction and durability are still superior. Visable "C" wear indicator reminds you when to change spikes. Marks on the green are minimized with this green friendly design. Disk packs of 18 spikes in the Slim-Lok (Tri-Lok or Fast Twist) or Q-Lok systems. The Pins system has 20 spikes and the Small (Steel thread) system has 22 spikes.