Thank you for viewing. I believe this is a YONEX stringing tool for manual stringing. I found it in a box while cleaning, so I'm putting it up for sale. I think it's a tool used to wind the string during manual stringing and prevent it from loosening. The YONEX mark is made of a fibrous material. The part where the string is wound seems to be leather-like. There are traces of string winding. It may be used with the GOSEN stringing machine I am also selling. I do not smoke, and I do not have any pets. Please understand that this is a used item before purchasing.