I purchased this here before, but I couldn't get used to it and have been storing it for a long time. The following is the description from the previous seller: This is a mouthpiece made by Atelier Momo, based on the Best Brass Yuui model, with a modified inner diameter. The inner diameter is slightly larger than the original, at 17.5mm, with a throat of 4.5mm and a slightly deeper cup. For reference, the specifications of the Best Brass Yuui model, which it is based on, are shown in the fourth photo. The body is satin pink gold, with an inner pink gold finish, and has undergone Atelier Momo's unique acoustic treatment. The shank is an Alexander (European) shank. The shank has some scratches from use, and some of the plating is slightly peeled off. ↑ While I was storing it, there are some thin spots here and there. It might come off if polished, but I will sell it as is. Also, there is no Atelier Momo engraving due to the satin finish, but it was indeed in an Atelier Momo package. I have since disposed of the package, so I will pack and ship the mouthpiece only.