Yamaha Cornet Mouthpiece CR-Neo17B4-S; mouthpiece for Eb cornet; rim inner diameter: 17.22mm; rim contour: Standard; cup depth: semi-shallow; throat: 3.80mm; backbore: semi wide; shank size: small; with a larger internal rim diameter than the CR-Neo16B4-S; this model offers extra freedom for advanced players; the newly designed Neo cornet mouthpiece has an S shank designed specifically for use with Eb cornets, providing ideal resistance and playability for British brass band performance situations