TheSwissStop Disc 34 Endurance Shimano Dura Ace Brake Padsarebased around the class leading SwissStop Organic pad,but tweaked for applications requiring greater endurance. Ideal for E-Bikes. SwissStop Disc 34 Endurance Shimano Dura Ace Brake Pads Features Long lasting, high endurance pad compound Organic formula is low noise and rotor friendly Very easy modulation of braking force High temperature stability for consistent brake power Supplied as pairs (for one wheel) Fits: Shimano Dura Ace BR-R9170, BR-RS805, BRRS505, BR-RS405, BR-RS305