TRP&';s two-piece rotors offer superior heat dissipation due to the aluminum center as well as excellent stiffness to provide you with confidence in your braking and lighter weight in 180/203mm sizes. Two-piece is now combined with TRP&';s new slotted rotor is design. Six recessed slots create channels to allow water, mud, and other debris trapped between the pad and rotor to escape under braking. When debris gets trapped between the pad and rotor braking power is dramatically reduced, these recessed slots maintain a more consistent brake feeling in mixed conditions. SPECS Sizes: 140mm, 160mm, 180mm, and 203mm Six slots to remove water, mud, and debris Two-piece design for heat management and stiffness 6-bolt Rotor thickness = 1.8mm If your new rotors are a different size than the ones you&';re replacing, then you&';ll need new brake adapters! Check out our guide to getting the right brake adapters to spend less time on the computer and more on the trails.