Andoer Leather Ligature Fastener with Plastic Cap for Soprano Sax Saxphone Bakelite Mouthpiece Durable Designed for soprano sax with bakelite mouthpiece. The ligature can help to hold the reed to the mouthpiece, helping to make the sound a lot better and the tone more even. The plastic cap can help to prevent chipping and breaking of the sax mouthpiece. Durable and works well.