Breslmair 3F4S (Horn Mouthpiece) 3F4S 3 → Wide and round, 4.07mm F → Cup diameter 17.6mm 4 → Cup depth: Deep S → German shank Throat diameter 4.3mm New price: 20,000 yen Used a few times The sound has clearly changed. I've decided to use a different size, so I'm selling this one. Wide rim for a stable feel on the mouth.