Yamaha SilentBrass practice mute for trombone in good condition. The newer model of this mute sells for about $250 new, so hopefully this is a good deal for any trombonist. Practice almost silently while still being able to hear yourself. Perfect for practicing in an apartment or any shared living space without anyone hearing you! I cleaned up the outside myself, and the electronics inside seem to work fine. The foam is a bit dried out and cracked, but it still seals properly so sound won't escape. Battery included; headphones and aux cord (required) not included, but I can throw in a nice aux cord for $10.