Beechler Diamond Inlay Alto Saxophone Mouthpiece Model M7 The Beechler Hard Rubber Diamond Inlay mouthpieces provide the variations needed to produce an individual richness and quality of tone Select from three bores and six facings (e g , M5 = Medium bore, 5 facing) Beechler Bore Choices The Small Bore The design of this bore enhances the higher frequencies of the instrument