Beechler Diamond Inlay Tenor mouthpieces are only offered in a medium bore. (We still have some Large and Small bore in stock!) It has an open style baffle and open chamber producing a medium fast air column allowing for the production of subtleties of sound while maintaining ease of projection. The large bore has a medium baffle and open chamber which produce a rich saxophone sound. The materials used for these mouthpieces is a sturdy combination of traditional hard rubber and new age plastics designed to utilize the full dynamic range of the instrument