The Osmun 3C Star Trumpet Mouthpiece is a unique blend of old and new mouthpiece design. The cup is based off an old vintage Tottle 3C Star Mouthpiece Top. It is not as bowl-shaped as a Bach 3C and slightly shallower. The rim is a basic "3" diameter with a comfortable bite with enough room under the edge to produce crisp articulation. This Osmun 3C Star was designed for the trumpeter who wants a "little more" from their basic 3C mouthpiece. It also will work well as a lead mouthpiece for the trumpeter who normally plays larger orchestral sized mouthpieces. Warburton/Kanstul threaded for backbores. Made in the USA.