KNOX "American Series" Tenor MouthpieceThese mouthpieces are made to order, cut by hand, one at a time like in the workshops back in the 1940??? s and 50??? s from high quality ebonite by Sebastian Knox. Hours of hand finishing ensure optimal balance between color, response and stability resulting in a playing experience unavailable with a mass produced product. ?? Tenor Sizing: 6* (. 095" + . 002") 7?? (. 100" + . 002") 7* (. 105" + . 002") 8?? (. 110" + . 002") 8* (. 115" + . 002")