About the Products: The best replacement for your damaged, dirty or old control knobs. Made of high-quality metal, which is not easy to rust and corrode, longer life. The minimalist design of the domed cylinder makes your guitar and bass more unique and elegant. Perfect for your various styles of guitar or bass and control the volume. Specifications: Product Name: Guitar Speed Control Knobs Material: Metal Color: Black Height: 18mm/0.7inch Diameter: 18mm/0.7inch Package Include: 6 Pcs Volume Tone Dome Knob About US Biaungdo focus on retail and wholesale hardware items and other accessories, all of the products we sell are strictly selected, and we provide high-quality, the most popular, affordable price products worldwide. Warmly Note: 1.)The colors may have differences in the different displays, please understand. 2). Please allow 1-2mm error due to manual measurement, please make sure you do not mind before you bid. 100% Satisfaction Guarantee: We are super confident in the quality and comfort of our product that we offer a 100% satisfaction guarantee! Try our products and if you don't absolutely love them just let us know. We are committed to bringing all of our customers a pleasant shopping experience.