Tame the Savage Beast Tuning the Eb clarinet can be a major challenge, so we designed a bell as fearless as most Eb players. Adding yet another dimension of versatility to your impressive repertoire, the Backun Eb Bell aligns the registers and delivers a warm tonal centre to your sound. The Backun Voicing Groove is standard on all Eb Bells. Specs: Backun Voicing Groove. Standard or Selmer Paris fit. Adaptable to most Eb clarinets.