Optional rubber pads and springs SIMAGIC P1000 Hydraulic further tuning of the brake pedal. Does not include hydraulic cylinder P1000: T-shaped support pad and connecting pad. Yellow: Soft Blue: medium soft Red: medium hard Green: hard Braun: very hard Dimensions: Springs: Diameter 18 mm - Height 21 mm Rubber: Diameter 21 mm - Height : 6 mm