1 set of 6R guitar wrenches and 1pcs bass tuning pinsThe ratio is 1:21. You can fine-tune the bass. The gear is made of bronze, plated with chrome/nickel. Chrome plating has passed 48 hours of salt spray test. And you won't see any bubble on the surface. The absolute best choice for your beloved bass! Machine heads:Set of 6 pcs. Guitar KeysQuality Sealed Machine HeadsWith Heavy Duty Internal Gear6pcs Mounting Screws Are IncludedStainless Steel and Zinc Alloy MaterialColor: Black Bass Tuner Pin:Compatible with Electric Bass GuitarWith Heavy Duty Internal GearMounting Screws and Sleeves Are IncludedMaterial: SteelColor: SilverType: RightPackage Contents:6 x Machine Heads6 x Mounting Screws1 x Peg Bass TunerOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.