This is a Vandoren M30 for Bb clarinet. The piece has been used in the past but is in very good condition. Its facing profile is very clean showing some cosmetic blemishes around the outer tip rail. Its tip opening measures .045” or 1.15mm.
The Vandoren Paris M30 mouthpiece was designed to provide more flexibility. It has a sonority similar to the B40 but has easier sound production qualities.
-Vandoren Paris