This is a product from MASAKI, a new Japanese mouthpiece maker. I bought it when I was having trouble deciding on a mouthpiece and was trying out various options. It's a U-cup with an inner diameter of 17.5mm. It's practically unused. Contrary to its linear design, it has a very pure and gentle tone. The weight is somewhere between Yamaha and Bach. The rim has a slightly flat, rounded shape at the apex, making it very easy to play.