Flexible and . The for rings are a color rubber-like that resists cracking and color fading. It's a fast, easy, colorful ways to identify your keys, and it use organize your keys by color and never mix up keys again. So you can save a of for time to to do. Different colors can correspond to different room keys. The for rings can adapt to the shape of most standard keys, best for small to size keys. It worked by giving your keys to wear a protective sleeve, and your keys from dirty. You can easily.