Breslmair 1G4S Horn mouthpiece. 1G3S 1 → Rim is rounded and thin, 3.73mm G → Cup diameter 17.9mm 4 → Cup depth: Deep S → German shank Throat diameter 4.3mm Since it is used, please understand no returns/no claims. Please refrain from price negotiations. If it doesn't sell, I will lower the price. I will pack it with bubble wrap and send it in a Takkyubin Compact box.