No price negotiations. No bulk purchase discounts (shipping discounts). Please refrain from individual negotiations. Please purchase directly without waiting for a response. I aim to ship within 24 hours, so I will not comment until the item is shipped. Thank you for your understanding. *I do not issue receipts. Set of 4, unused. Cylindrical aluminum machined knob. Due to its small size, it seems useful for dressing up effects pedals, etc. The size is approximately 14.9mm in maximum outer diameter and approximately 12.4mm in height. The shaft receiving diameter is approximately 6.4mm, and it is the type that fixes the shaft with a flathead screwdriver, so it can be used with both USA and Japanese potentiometers. Use for repairs and customization of vacuum tube amplifiers, tube amplifiers, stereos, antique radios, audio equipment, guitar amplifiers, and effects pedals, as well as for dressing up bizarre guitars. Images 4 and 5 are reference images for size comparison. Shipping is by regular mail (no tracking number), so it will take some time for delivery (even in Kanagawa and surrounding areas, it may not arrive in 3 or 4 days). *If you let me know in the comment section before purchasing, I can change to "Click Post" with faster delivery and a tracking number for an additional 50 yen. Sets with different quantities are also on sale. *If you need a large quantity, please contact me in the comment section. I will respond to your needs. Recycled materials are used for packaging.