Orchestral & Wind Instruments
Bach K350 Mega Tone Trombone 6-1/2A
Bach K350 6-1/2A, Mouthpiece for Trombone, Series K350, Mega Tone, Small shaft, Cup diameter: 25.40 mm, Cup depth: Medium deep, Bore: 5.85 mm (.230"), Backbore: 402, Silver-plated
https://www.bizrate.co.uk/orchestralinstruments/bach-k350-mega-tone-trombone-oid1274260771.html
