This is a Greigewait mouthpiece made in Austria. It has a 9-5 opening and a design similar to the B40 Lyre. The pitch is 442Hz. Please refer to the compatibility chart for each manufacturer. It has a much more substantial feel when playing compared to Vandoren, and despite the opening, the sound is well-focused. The 442Hz model makes it much easier to achieve accurate intonation than popular mouthpieces. I purchased it in October and used it for about a week, but I've decided to go back to my original mouthpiece, so I'm selling it. Although there are no issues with playing, please note that there are some scratches on the ligature from use.