This product is a potentiometer knob, which is made of durable acrylic material, with good texture, safe and practical. Easy to install and use, it can be easily applied to your instrument, a very practical accessory that will meet your needs well. Features -Color:Assorted Color -Material:Acrylic -Size:2.50X2.50X1.70cm/0.98X0.98X0.67in Inner hole diameter: 6mm - The volume knob has smooth surface, giving you a great hand feeling and using experience. - The volume cap can be installed on the guitar control panel and is easy for you to adjust the volume. - Not only used for controlling the guitar's volume but also for positioning of tone/timbre, and etc. - The volume knob is perfect for replacement of guitar bass and amplifier. Easy to install for a tight fit and secure fit. - With fine workmanship, simple in design and very practical in use, easily win your favors. Package list: 4 x Guitar Knobs