Thank you very much for viewing. This is a YAMAHA Silent Brass ST9 (for trombone and bass trombone). I purchased it 7-8 years ago and used it a few times. The rubber part of the mute appears to be slightly damaged, but there are no problems with its use. I also confirmed that the sound source module "Personal Studio" works without any problems. All accessories are included. Although it is an old model, if you have never used one, please take this opportunity to experience it. (Accessories) Instruction manual, pickup mute, power supply unit, earphones Please understand that this is a used item, and we appreciate your consideration.