This is a Warburton straight mute for trumpet. The model number is TR-7, and the manufacturer's description is copied below. TR-7 – Cedar Straight • A clear, sweet sound, capable of the projection of a metal mute. Very versatile. Cup • A beautifully resonant cup sound, perfect for solo work. I purchased this about 5 years ago, but I haven't used it much. I will also include a Neotech mute pouch that this mute barely fits in. Thank you.