Product Description Specifications:Application:Road, Gravel, CyclocrossType:hydraulic, 4 pistonsActuation:mineral oilTechnical Information:Mount:post mountPistons:4Design:1-pieceMaterial:aluminium (2014 T6)Compatibility:Shimano Dura Ace Di2 R9170Shimano Dura-Ace R9120Shimano Ultegra Di2 R8070Shimano Ultegra R8020Shimano 105 R7020Shimano Di2 R785Shimano RS685Shimano GRX RX810Shimano GRX RX600Shimano GRX RX400Shimano GRX RX815 Di2Shimano GRX RX817 Di2Campagnolo Super RecordCampagnolo RecordCampagnolo H11Features:hydraulic brake caliper for drop bars with flat mount attachmentfor 160 mm to 180 mm front brake rotors or 140 mm to 160 mm rear brake rotors4-piston design for precise braking efficiencyexcellent stiffness thanks to 1-piece constructionCNC machinedimproved hose connectionbrake pad sets for road or cyclocross and gravel Note: To find out which RX4+ brake caliper fits your bike and which disc brake adapter you may need, we recommend that you consult the Hope Brake Caliper Diagram. Manufacturer Number:HBSPC77 Contents:1 x 1 x pair Hope blue brake pads for road1 x pair Hope red brake pads for cyclocross / gravel2 x bolts1 x R-clip2 x washers1 x pad retaining bolts1 x spring1 x olives1 x inserts1 x compression hose nut1 x copper washer1 x syringes1 x hose with adapter2 x bleed blocks Manufacturer: Hope Mill Calf Hall Road Barnoldswick Lancashire BB18 5PX United Kingdom info@hopetech.com Distributor: bc GmbH Carlo-Schmid-Straße 12 52146 Würselen Germany info@bike-components.de