YAMAHA Silent Brass SB5-9 trombone bass trombone from JPN The set includes ... Personal Studio ST9, PM5, 9V battery box-pickup mute, strap, stereo earphones, connecting cable (PM5-ST9) Pickup mute specification (PM7)    108  270mm, 270g Personal studio specification (PT9)    75 (W)  70 (D)  25 (H) mm, 55g (excluding batteries)