The Warburton Size 3 Gold Trumpet and Cornet Mouthpiece Tops feature a .670-inch inner diameter and a 1.080-inch outside diameter. The Gold material offers excellent feel for players that prefer a slightly more slippery surface for easy flexibility or that might have a reaction to regular mouthpiece materials on sensitive skin.The Size 3 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.