Please consult for multiple quantity orders. These are metal knobs used for customization. They are for 6mm shafts. They have two rubber rings to prevent slipping, and small holes are drilled as a design element. The inside is resin, making them less prone to noise. ※The image is a sample. Please understand that there may be scratches, rust, dullness, dirt, chips, paint lifting, etc., which may have occurred during transportation or storage. Please acknowledge this and purchase with no returns or claims.