Features: The ratio is 1:21.you can tune your bass precisely. The gear ismadeofsuperbmaterial plated with nickel itisendurable. thenicechoice for your beloved Bass! Compatible with electric bass with heavy duty internal gear mounting Screws and ferrules are included. Specifications: Type: Type 1: 1pcsleft/ Type 2: 1pcsright/Type 3: 4pcsright/ Type 4: 1pcsleft+ 4pcsright(Optional) Material: Steel Color: S-ilver Quantity: 1pcs Packagesize: 100 * 70 * 40mm Packageweight:Type 1: 80g/ Type 2: 80g/Type 3: 320g/ Type 4: 400g Packinglist: Type 1: 1pcsleft/ Type 2: 1pcsright/Type 3: 4pcsright/ Type 4: 1pcsleft+ 4pcsright(Optional)