This is brand new and never used.  Fits Barudan machines with 520 needle space.  12mm hooping area.  

Now embroiderers can hoop their projects easier than ever. The Freedom Ring hoop eliminates the need to tighten and loosen screws.

No Thumbscrew No Magnets No Problem! A powerful, self-adjusting extension spring on outer hoop provides equal tension every time you hoop. For your current Barudan machines. Reduces, and often eliminates hoop burn caused by over tightening a thumbscrew. Elimination of the  thumbscrew means no more wasted time adjusting the hoop for the fabric weight. No thumbscrew means less pain hooping for those with carpal tunnel syndrome or arthritic hands.