Pedal Footswitch Topper, barefoot buttons, guitar effect nail cap for added accuracy and comfort[3 screws] caps stay tight with 3 set screws and rubber insert. The rubber insert also protects the foot switch. [For 3/8 inch 10mm switches] outer diameter 23mm inner diameter 10mm for use on very common 3/8 inch 10mm pedal effects switches. It does not fit into another size switch. [Increase the comfort of accuracy] easier to see and hit with a larger aim. Not the sting of your feet. And your pedalboard looks better and more like an upgrade. [Aluminum] Durable duraluminum never crush and eternal color by anodic oxidation finish. [Installation] press to fully turn on the switch when tightening the screw set. Color: SilverMaterial: Aluminum Alloy Size:Product Size:Outer Size 24x12mmInner Diameter 10.4x20mmPackage Content:10 x Guitar Effects CapOnly 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.