This is a K Plume ligature for Selmer rubber alto sax mouthpieces. It offers a moderate resistance, making it very easy to play, and produces a rich, resonant sound. I purchased it about six months ago, but I'm selling it now because I'm using a different ligature. It has never been used in a performance and was used for a few hours once a week. This is a used item, so please purchase only if you agree with the above. Additional information: The material is brass.