It's a ring I made a while back, I print it for my friends and family as gifts, or for some special events. You can also set it to change colors (by swapping the PLA during the print) for it to have the cool 2 color effect. I made the ring so it can almost fit anyone (17 mm diamater, 6 ½ (USA and Canada size) or M ½ (for the UK)). I think it's pretty neat and i use it to style my own fits. Sometimes there can be a problem with filament blobs in the inner side of the ring but it can be easily just torn off to be honest.