Durable Material: The knobs are made of plastic, which is sturdy and durable, ensures a long time of use. Smooth Surface: Delicate workmanship with good texture and providing a smooth surface for use. Easy to Use: Fits pots with a diameter of 15mm, easy to use and install. Use for guitar volume/sound control.Nice accessories: Specially designed for guitar, suitable for guitar lovers. It is used for dirty and old knobs. Package Included: 3 Pcs Control knobs and internal hex key. Great replacements for dressing guitar parts. Specification: Material: Plastic Color: White/Yellow/Red/Grey Package Weight: approx.12g Knob Size: approx.18x18mm/0.70x0.70in Wrench Diameter: About 1.5mm/0.05inPackage Included: 3pcs x Guitar Knobs1Pc x Internal Hex WrenchNote: Please allow 1-3mm error due to manual measurement. Make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!