S.E. Shires iSeries F-Attachment Dual Bore Trombone w/ Gold Brass Bell
A new, smaller diameter, dual-bore rotary valve is fast and lightweight, and maintains the bore’s cross-sectional area through the valve. Its dual-bore slide (.525/ .547 inch) produces a large-bore sound with a medium-bore effort, while the available .547" single-bore slide lends a more open feel. Available for small shank mouthpieces (mouthpiece included).