The Seismic Premium Pucks are designed for those that go slide at high speeds. The premium formula can withstand the heat at higher speeds because the material won't melt due to the fact they have less abrasion with the surface. The Hexagonal shape lets you clock a preferred angle on which you place it on your glove. With superior durability these will probably last you throughout the racing season or even longer! With the addition of six big flints your slides are on fire! Size: Outer diameter 82.5mm / 3.25″ and 12mm thick.