Warburton P.E.T.E. by Warburton. This is a mouthpiece trainer for basic embouchure training for brass players. It helps prevent embouchure collapse and is expected to strengthen the muscles that support high notes. By using it in conjunction with instrument practice, you can expect to expand the range and improve the endurance of brass instruments such as the trumpet. You can feel the load on the depressor anguli oris muscle, and I think you can feel the same effect as a long tone. However, it puts a strain on the muscles around the mouth, so please use it at your own pace. Please refrain from comments asking for a price reduction. Immediate purchase is OK. If you are interested in used mouthpieces or new mouthpieces, please search for Net Brass. net-brass.com