This is a horn mouthpiece by Wermer Chr Schmid. It's a rare mouthpiece. ○ Size Model: Prof. Doeler 1-1/2 Cup Inner Diameter: 17.3 Throat Diameter: 4.2 Cup Type: Close to U-cup Cup Depth: 26.0 Medium Shank: American Finish: SP I'm selling this because I've escaped the mouthpiece rabbit hole. Please understand that there is some wear and tear. Since it's used, please refrain from returns or exchanges. Please do not negotiate the price. If it doesn't sell, I will lower the price. It will be wrapped in bubble wrap and shipped.