Compatibility: [10mm] 10S fits 170mm Front Rotors, [20mm] 20S/20P fits 180mm Front and 160mm Rear Rotors, [30mm] 30P fits 200mm Front and 180mm Rear Rotors, [40mm] 40P fits 170mm Rear Rotors * Attachment Type: 140mm rear post mount, 160mm front post mount * Material: aluminum, steel * Manufacturer Warranty: 2 years