Schilke Standard Series Trumpet Mouthpiece Group I In Silver 13A4 Silver Few companies know more about mouthpiece manufacture, design and physics than the Schilke Company They make a complete line of excellent trumpet mouthpieces that work with any instrument but especially compliment their fine line of outstanding trumpets Schilke Mouthpiece Numbering SystemsThe Schilke method of mouthpiece labeling has been designed to assist the student, teacher, amateur and professional in selecting a mouthpiece to meet the needs of the player All mouthpieces come with standard rim shapes, cup volumes, and backbores unless shown otherwise on the mouthpieces This method enables the player to know the characteristics of their trumpet mouthpiece