These knobs are something I bought about 10 years ago after falling in love with their appearance. I had them on one of my basses for a while, but on standard JB and PB types, the knobs were too overpowering, so I switched back to the originals and put these away. The size is approximately φ25 x 14H, and they are the type that is secured by tightening with a hex wrench from the side. ※ Although there are 5 in the photo, this listing is for 2. Please be aware.