The ratio is 1:21. You can tune your bass precisely. The gear is bronze material plated with Chrome/Nickel. The chrome plating has pass 48 hours salty spray test. And you will not see any bubble on the surface. Absolutely the for your beloved Bass Compatible with electric bass With heavy duty internal gear Mounting Screws and ferrules are included The ratio is 1:21. You can tune your bass precisely. The gear is bronze material plated with Chrome/Nickel. The chrome plating has pass 48 hours salty spray test. And you will not see any bubble on the surface. Absolutely the for your beloved Bass Compatible with electric bass With heavy duty internal gear Mounting Screws and ferrules are included Colour:silver Material:steel Size:10cm x 7cm x 4cm Package Contents: 1 x Left winder 1 x Right winder 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.