Shimano Deore XT SM-RT86 6-Bolt Disc Rotors ?FEATURES: 3-layer structure with aluminum core and two stainless steel outer layers reduces rotor surface temperature approximately 100 degrees Celsius compared to all-steel rotors Aluminum spider Includes rotor fixing bolts and non-turn washers SPECS: Rotor Type: Two Piece Hub/Disc Compatibility: 6-Bolt Disc Pad Compatibility: All Pad Compounds