Colored rubber things that go on keys?

I am looking for those color coded rubber things that go around the outside of a key head to differentiate between different keys that look alike. I have no idea what they are called; I have tried searching for "key labels" and "key tags" but I keep coming up with the paper coin labels that you... show more I am looking for those color coded rubber things that go around the outside of a key head to differentiate between different keys that look alike. I have no idea what they are called; I have tried searching for "key labels" and "key tags" but I keep coming up with the paper coin labels that you attach like a key ring? Does anyone know what I'm talking about? Can anyone tell me what they are called, and better yet, where I can find some? Thank you!!!
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