This is a Schmidt Digital 1.0 18mm horn mouthpiece. It has an inner diameter of 18mm and a shallow V-cup. The mouthpiece itself feels very light, and the sound is bright. I usually use a rather heavy mouthpiece, so I'm not used to this one. I've only played it a few times just to test the sound, and I've never used it in orchestra practice or anything like that. It produces sound easily, so I think it would be suitable for those who want to conserve energy and play lightly and brightly.