- Brand: YAMAHA - Model: 32C4 - Type: French Horn Mouthpiece This is a standard size mouthpiece. It has been used a bit, but it's in relatively good condition. The following is quoted from the YAMAHA website: Retail Price: 7700 yen Part Number: HR-32C4 Rim Inner Diameter (mm): 17.48 Throat Diameter (mm): 3.98 Features: This model has a larger rim inner diameter than the 30C4, allowing for a greater volume. It has a relatively flat rim of moderate thickness, and is particularly good for articulation. Snoopy Mouthpiece Case It has been used for several years, so there is some dirt, but there are almost no noticeable marks.