Lighter than their older Marta SL Rotor, Magura's Storm 6 Bolt Rotor is standard on their Louise Brakesets, and it can be used with Marta brakes as well. It's lighter because it has vent holes drilled into the braking surface, and its gentle sawtooth shaping decreases the chances that you'll experience brake squeal. The Magura Storm 6 Bolt Rotor will work with any 6 Bolt compatible hubs. It comes with fasteners.