Forever Wave flags zip onto any size sleeve. They are the only interchangeable flag system for Roll Bars, CB Antennas, ATV's Golf Carts, Boats, and More! Their system consists of two parts: the sleeve and the interchangeable flags that attach to it. The sleeve attaches to a bar or post and the flags zip on/off the sleeve. Each flag has a zipper attached that matches up with the zipper on the sleeve. This allows you to swap out different flags as often as you like. The flag sleeve is made of marine grade outdoor mesh, sewn with UV protected outdoor thread. The flags are mostly outdoor nylon. The zippers are heavy-duty marine grade. This product is built to last and can withstand wind and outdoor elements. Most of the flags measure 12x18 inch unless specified. Made in the USA.