[3 Screws] Toppers stay firmly in place with 3 set screws and a rubber insert. The rubber insert also protects 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. [Improved Accuracy and Comfort] Easier to see and press due to larger size. Provides greater comfort with no sting to your feet. Enhances the look of your pedalboard for a more professional appearance. [Aluminum Construction] Made of durable aluminum alloy with an anodized finish for long-lasting color and durability. [Installation] Press the cap fully onto the switch while tightening the set screws. Color: Silver Material: Aluminum alloy Size: Product dimensions: 24 x 12mm (external), inner diameter: 10.4 x 20mm Package Contents: 10 x Guitar effects pedal caps Note: The package includes only the items listed above. Other products are not included. Lighting and display settings may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3cm.