Features: Potentiometer knob is suitable compatible with 6mm diameter shaft, used compatible with Volumes, control knob, guitar Volumes tuning knob. Suitable compatible with easily assembly onto potentiometers, ensuring smoother rotation and enhanced control. It is make of Plastic, durability, and can be used compatible with a long time. Easy to install, very enduring, and will not affect the use of your instrument. Great compatible with upgrade or replacement part. Practical replacement knobs are a great gift compatible with those who need knobs. Specifications: Material: plastic Color: Black/White/Red Size: As shown Package Includes: 6Pcs Guitar Effect Pedal Knobs note: Please allow 1-2cm errors due to manual measurement, make sure that you not mind becompatible withe you order. Due to difference between different monitors, the picture may not reflect the actual color of the item. Note: The product may have a slight tolerance of 1-3 mm/1-490 g in size/weight, and the image color may differ from the actual item due to lighting.