In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. This is the definitive book on mouthpiece comparison for the trumpet player. Just about every major brand series is carefully measured and the details placed in easy to read tables. The data is shown in several different fashions: manufacturer-largest to smallest; by cup depth; by inside diameter, etc. A great way to understand how slight changes in mouthpieces can change the playing characteristics of your instrument.