AR Resonance Top 33.00 H 80 Bronze Tuba; mouthpiece top for tuba; inner cup diameter: 33.00 mm; throat size: 8.0 mm (80); cup depth: Shallow and V shaped; shallowest cup, somewhat similar to what the Helleberg is, the entrance to the throat is sharper, to increase the quality of articulation, rim is more comfortable; weight: L (light = standard); material: Bronze, silver plated; made in Italy