1、The ratio is 1:21. you can tune your bass precisely. 2、The gear is made of superb material plated with nickel, it is endurable. 3、Absolutely the nice choice for your beloved Bass! Features: The ratio is 1:21. you can tune your bass precisely. The gear is made of superb material plated with nickel, it is endurable. Absolutely the nice choice for your beloved Bass! Compatible with electric bass with heavy duty internal gear mounting Screws and ferrules are included. Specifications: Type: Type 1: 1pcs left/ Type 2: 1pcs right/ Type 3: 4pcs right/ Type 4: 1pcs left+ 4pcs right(Optional) Material: Steel Color: S-ilver Quantity: 1pcs Package size: 100 * 70 * 40mm Package weight: Type 1: 80g/ Type 2: 80g/ Type 3: 320g/ Type 4: 400g Packing list: Type 1: 1pcs left/ Type 2: 1pcs right/ Type 3: 4pcs right/ Type 4: 1pcs left+ 4pcs right(Optional) Type 1: 1pcsleft/ Type 2: 1pcsright/Type 3: 4pcsright/ Type 4: 1pcsleft+ 4pcsright(Optional)