TRP Centerlock-25 Rotor, 2-Piece Stainless Steel, 180mm:The TRP 25 2 piece slotted centerlock disc rotor offers high heat dissipation and tolerance due to the aluminium center as well as excellent stiffness to provide confidence in your braking. 1. 8mm standard thickness 5 recessed slots create channels to allow water, mud, and other debris trapped between the pad and rotor to escape during braking Stainless steel rotor with alloy carrier Compatible with Centerlock hubs Does not include lock ring Item