Avid HS1 Heat Shedding Rotor Utilizing cross-drilled technology, the lightweight HS series stays cooler when your ride heats up Offers enhanced wet-weather performance and takes braking to a whole new level of smooth Comes standard on 2012 X0, Elixir 9, Elixir 7, Elixir 5, Elixir 3, Code, and Code R brakes 104 grams (160mm)