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aluminium alloy Bike brake piston--manufactured with aluminium alloy material, and enough to use. ​,Metal Piston Hydraulic Brake Caliper Bike brakes kit--surface groove air hole design, can reduce the heat transfer area, increase , which will help to heat,Brake Kit Bicyclea repair kit--the strip groove design reduces the heat transfer area and increases the airflow shuttle. conducive to heat dissipation.​,Brake Kit Metal brake--high precision machining,the outer diameter is coreless, the outer diameter tolerance is plus or minus 5um, the roundness is 3um, and the roughness is ra0,4um,Brake Kit Bike seal kit piston--tested, smooth degree of durability, brake force, sealing, they are practical brake piston tools, keep your brakes safer,Brake Kit