I purchased two sets and tried them, but they weren't suitable for my needs, so I'm selling them. If you'd like, I'll include the removed tape as well. *This is a sale of the knobs only. Please note.* Product description from the following site: These are knobs that can be attached to the holes of file boxes. They make it easier to pull out file boxes even when placed on a shelf, and the different colors can be used for identification. *Exclusively for polypropylene file boxes. Cannot be used on wooden or paper file boxes.* *Cannot be removed and reused.*