Model 2AK Rim Outer Diameter: 25.5mm Cup Inner Diameter: 17.5mm Throat Size: 4.8 Extremely Deep Cup Shape: K = V Cup Silver Plated Finish (SP) ■J.K. french horn mouthpiece Josef Klier SP ■In English, it's read as "Jay Kay," and in German, it's "Yot Car." Yot Car regularly researches mouthpieces with professional musicians. They solve problems that musicians have with mouthpieces using their unique technology and manufacturing methods. The series includes the K series, M series, and SD. The K series has a V cup, and the M series has a U cup. There are five models with different rims/cups, numbered 01, 1, 2, 3, and 4, and six different throat sizes. The condition is only minor scratches from use, and there is no history of being dropped.