The 5RV Lyre with a larger tip opening and a longer facing guarantees flexibility and roundness. This mouthpiece has an exceptional quality of sound. - the manufacturer
• Lyre indicates a more open mouthpiece. • Profile 88 (P88) indicates a longer, narrower beak than those on non-P88 models. • 13 Series indicates a model made for American pitch (A=440) and the R13 clarinet, popular in the United States.