willie's Custom Brass Willie's Euphonium Mouthpiece 321 & 621 Series 321S Thin Bore (SP)

Specially designed for Yamaha YEP-321. Dominate the band with the bright, enveloping sound unique to the V-cup. Rim diameter 25.50 (mm) Throat diameter 7.10 (mm) Approximate size from other companies: Back 5G