The X-14 rim is extremely comfortable with a nice inside roundness. There is some undercut for chop room, which makes the .600″ inside diameter feel a little larger than the specs reflect. The cup is a medium shallow to shallow (similar to Bach D/E) bowl. The rounded entrance to the throat allows good air flow for a nice big sound. Slotting is excellent with the X-14. The Legends X-14 was inspired by a vintage Selmer X-14 mouthpiece. It has the same rim and cup, but has the Legends enhanced throat (#27), enhanced throat cylinder length, and the Legends S backbore. These design updates improve endurance, range, and sound for the player. The inside rim diameter and cup depth may seem suited for upper register playing, but this mouthpiece is actually good for any style of playing.