Bugle Signals, Calls and Marches: For Army, Navy, Marine Corps, Revenue Cutter Service and National Guard. E-book. Formato PDF Daniel J. Canty   -  Forgotten Books, 2017  - 

In selecting mouthpieces the cup of same should correspond to the size of the lips, namely, those with thin lips should use a mouthpiece with a small cup, medium lips a medium cup, large lips a large cup. Always use your own mouthpiece and, preferably one that has a nickel or silver plating.