[3 Screws] Toppers stay firmly in place with 3 set screws and a rubber insert. The rubber insert helps protect the pedal switch. [For 3/8 Inch 10mm Switches] Outer diameter 23mm, inner diameter 10mm, designed for common 3/8 inch 10mm effects pedal switches. Not compatible with other switch sizes. [Increased Accuracy and Comfort] Larger surface area makes it easier to see and engage, improving accuracy. Provides a more comfortable feel underfoot with no sting. Enhances the look of your pedalboard for a cleaner, upgraded appearance. [Aluminum Construction] Made from durable aluminum alloy with an anodized finish for long-lasting durability and color retention. [Installation] Press the cap fully onto the switch before tightening the set screws to ensure a secure fit. Color: Silver Material: Aluminum Alloy Product Size: External Dimensions: 24 x 12mm Inner Diameter: 10.4 x 20mm Package Contents: 10 x Guitar Effects Pedal Caps Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3cm.