Heavy duty internal gear, Economy sealed bass tuning keys set for Precision Bass or Jazz Bass. Fits for 13.5mm peg hole Color: Black Great replacement for the old, broken tuning pegs. accessory of a bass, perfect ! Includes 4pcs(2R2L)bass tuners. Mounting screws, ferrules and threaded bushings are included. Replacement / Upgrade parts for electric Jazz bass or precision instruments. Gear Ratio - 1:22. finer tuning and greater stability. They are mainly made of durable hard zinc alloy material, and great for 4or5 strings bass tuning. They are quality sealed machine heads which are used to tune up your bass,Also great replacement for your broken or old bass tuners! With heavy duty internal gear.. and shiny, wear-resistant, anti-corrosion, and dust-proof, quick and accurate tuning. Beautiful shape will make your bass more attractive, help you be more confident in a bass show. material: metal Package Contents: 4 x Bass tuning pegs(2R2L) 4 x Ferrules 4 x Screws 4 x washers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.