S-RS Big 4 Pistons Brake Kit System Description CALIPER MATERIAL: ALUMINUM 6066-T6 SHAPE PROCEDURE : 3D CNC MACHINING TWO PIECE FORGED FORMING WAY: HIGH PRESSURE FORGING, PRECISION CNC 3D MACHINING SURFACE TREATMENT: HARD ANODIZING, ANODIZING, 4 LAYER NANO COATING-HIGH TEMP RESISTANT. PISTON SIZE: 36/40MM PISTON MATERIALS: 7075 COLD FORGED ALUMINUM ALLOY CORRESPOND SIZE: 330/355/380MM THICKNESS 28MM ROTOR MATERIALS : FC25 HB165~175 Inquire Now View More Details