Quality brass mouthpieces contribute to the high regard Yamaha has earned among beginning and professional musicians alike. The result of a special approach to design and manufacture Yamaha mouthpieces deliver the performance and comfort required where they are needed most: where instrument meets musician. The mouthpiece production technique used by Yamaha promises consistent quality mouthpieces time after time. Other manufacturers use a specific cutting tool to create every mouthpiece which causes problems as tools start to wear. This can result in inconsistent quality and poor performance. Yamaha s computer-aided design system and computer controlled lathe work together to produce the most precise consistent mouthpieces in the world. Featuring an innovative shape and extra-heavy gold-plate finish the Gold-Plated series is for advanced players who prefer a focused concentrated tonal core. Yamaha has chosen different weights and shapes for each model to ensure an ideal sound on each instrument. Trumpet Mouthpiece Specifications Model Rim Cup Depth Throat Backbore Playing Charateristics Inner Diameter Contour Thickness YAC TR8C4-GPR 16.3 mm semi-flat standard standard 3.65 mm semi-narrow Good for all-around playing including solos. Combines an extended high range with rich lows. YAC TR11B4-GP R 16.4 mm semi-flat standard semi-shallow 3.65 mm semi-narrow A somewhat shallow cup and medium rim for extra endurance. Brilliant tone. Suitable for D Eb and piccolo trumpets. YAC TR14A4a-GPR 16.7 mm semi-flat semi-thick shallow 3.65 mm semi-narrow Fast-response high range and powerful sound. Ideal for piccolo or lead trumpet. YAC TR14B4-GPR 16.7 mm semi-flat standard semi-shallow 3.65 mm semi-narrow Relatively large rim diameter and shallow cup. Outstanding overall balance for all musical genres. YAC TR14C4-GPR 16.7 mm semi-flat standard standard 3.65 mm semi-narrow Rim designed for outstanding facility and flexibility. Popular in ensembles and orchestras. Can produce high volume. YAC TR16C4-GPR 17 mm semi-flat standard standard 3.65 mm semi-narrow Large rim and medium cup for easy playability over a wide range. High volume. Excellent for symphony orchestra players. YAC TR17C4-GPR 17.1 mm semi-flat standard standard 3.65 mm semi-narrow Powerful dark sound. A popular choice with symphony orchestra players.