Using these fenders is super easy. First, open the package and take out the fenders. Then, punch out the shape as it's pre - designed. Next, fold along the perforated lines. After that, use the hook - and - loop straps to attach the fenders to your bike in one of the multi - mount positions. For safety, the reflective printing will work at night to make you more visible. When it comes to maintenance, just clean them with a mild soap and water. Don't use any harsh chemicals that might damage the reflective printing or the polypropylene material. And make sure to store them in a dry place when not in use.