David Shifrin's Signature Mouthpiece As a principal clarinetist for many reputable orchestras and a highly decorated educator, David Shifrin has raised the bar for clarinet artistry in innumerable ways. Designed to David's exacting specifications, the Backun Shifrin Signature Bb clarinet mouthpiece features a unique A-Frame baffle exit that represents the cutting edge of clarinet mouthpiece design. With its medium/long facing that perfectly accommodates cane and synthetic reeds, the Shifrin Signature mouthpiece is meticulously crafted of marbled slate hard-rod rubber. Join the clarinetists at Sweetwater who have taken their playing and sound to the next level with the Backun Shifrin Signature Bb clarinet mouthpiece!Backun Musical Services: reinventing the clarinet one piece at a time Founder Morrie Backun started with a small woodwind repair shop outside of Vancouver, Canada. At one point, he was asked to overhaul a clarinet with a missing barrel. So he set out to make a brand-new one