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. (May have some scratches or dirt from the time of purchase) Size: Outer diameter approximately 19.8mm, height approximately 11.8mm. Shaft hole approximately 6.5mm, the type that fixes the shaft with a set screw from the side, so it can be used with both USA and Japanese pots (please prepare a small flathead screwdriver). *Images 5-7 are reference images for size and do not include other items. Use for repairs and customization of vacuum tube amplifiers, stereo amplifiers, antique radios, audio equipment, guitar amplifiers, and effectors, as well as for dressing up bizarre guitars. Shipping is by regular mail (no tracking number), so delivery may take some time (even in Kanagawa and surrounding areas, it may take 3-4 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 available. *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.