O.Bass - The Bob Reeves - Brass Ark Orchestral Bass Trombone MouthpieceHandcrafted orchestral bass trombone mouthpiece in silver plate featuring a 28. 15mm rim inner diameter, medium wide rim, and deep cup. A powerful mouthpiece that is extremely efficient while delivering the breadth of sound needed for the demands of the modern bass trombone. Endurance and comfort is paramount on this design, yielding efficient tone production with a penetrating, dense bloom. Available as one piece solid mouthpiece or as a screw rim