The Warburton Trumpet and Cornet Mouthpiece Tops are arranged in a progression from large to small in ascending numerical order. The Warburton Size 9 Silver Trumpet and Cornet Mouthpiece Tops feature a .610" inner diameter and a 1.050" outside diameter. The Size 9 mouthpieces feature nine cup designs to offer the player the most efficient mouthpiece with which to perform in any given playing situation.The ESV, ES, S, SV or M cups are an excellent choice for the player looking for a studio lead trumpet sound. The S, SV or M cups work well for a piccolo trumpet sound. The M, MC or MD cups work well for a brass quintet sound. The MC, MD, D or XD cups are designed for an orchestral sound. Once the desired cup is found, it can be combined with a Warburton Trumpet Backbore (sold separately) to best balance the sound and resistance of the mouthpiece and allow the player to fine tune their sound.