YAD Shimano Original XT SM-RT86 6-Bolt Disc Brake Rotor Ice-Tech 160mm/180mm 1.3" high, 8.2" wide, keeps cool to minimize brake lock up Aluminum core construction with stainless steel sandwich type for lower weight and quicker heat dissipation Lowers operating temperature, Resists power fade, Increases pad life 3-layer structure with aluminum core and two stainless steel outer layers reduces rotor surface temperature about 100 degrees Celsius compared to all steel rotors Original brake rotor from Shimano factory, more guaranteed in using, includs 1 x 180mm Rotor, 6 x Bolts, 3 x Plates, 3 x Manuals