Cool Skull Head Tone Volume Control Knobs Buttons for Electric Guitar 3pcs/ Set + Wrench - Black Nickel This Volume Tone Knobs is Mini size, stylish design. About 22.3mm from head to chin 6mm inner diameter Skull head shape, decorate your electric guitar or bass become cool and unique. Item 100% looks like the picture shown with high quality. One set include 3 pcs skull head guitar knobs and 1pcs wrench(wrench color random) . Easy to Install. 100% satisfaction guaranty. If you are not satisfied with the products when you receive, please contact us, we will make a full refund.