Custom processing is the purpose of electric motorcycle disc brake brake size 40 (mm) model 22# applicable models motorcycle article number 22# specifications black (left), red (left), gold (left), blue (left), gray (left) , bronze (left), electroplated silver (left), hard oxygen (left), black (right), red (right), gold (right), blue (right), gray (right), bronze (right), Electroplated silver (right), hard oxygen (right) piston 4 piston material aluminum alloy CNC engraving and milling process hole distance 40mm