AR Resonance Top 25.40 60 Brass Trombone, Mouthpiece Top for Trombone, Inner cup diameter: 25.40 mm, Bore: 6.0 mm (60), Cup depth: Standard, Comparable to Bach 6-1/2AL, Schilke 50, 50C4, Laskey 54M, Greg Black 6C, Warburton 10, Denis Wick 6BS, 7CS,...
