Genuine MONETTE mouthpiece case. This is the type that can accommodate a wide range of mouthpieces, up to the STC-3 heavy model. It has been used to some extent, and there are some white marker marks on the top surface, which are the serial numbers I used when I used it. Please check the condition in the photos and purchase with your understanding. It's quite lightweight for its appearance, durable, and I think it's the best mouthpiece case. STC3 cases are not often seen, so please take this opportunity. Of course, it can also hold most commercially available mouthpieces such as BACH, YAMAHA, and LOTUS (special ones are not guaranteed).