This is a reflector for the rear of a Brompton bicycle that was included at the time of purchase. I believe it's a CATEYE reflector and band, with an original Brompton aluminum spacer added. It's new, in a bag, but I opened it for the photos. An instruction manual for installation is also included. According to the instructions, it's a kit for fixing to the rear carrier stays or near the rear end of the seat stays, but since a large, square reflector is originally attached to the rear, I don't think it's necessary to add it separately, at least in Japan, so it was unused. The reflector itself is made by CATEYE, and the resin bracket and fixing bolts are also CATEYE. If attaching to the rear carrier stays, this alone seems to be sufficient. To attach it near the rear end of the seat stays, it needs to be extended outwards by about 20mm, so a sturdy, original Brompton aluminum spacer and long bolt are included. The instructions mention two types of rubber spacers (SHIM), but the thin one is not included. It's marked with a red X in the instructions.