- AR Resonance Top M 72 E Brass Euphonium; mouthpiece top for euphonium; inner cup diameter: (M) 26.00 mm; throat size: 7.2 mm (72); cup depth: Standard; comparable to SM 4; weight: L (light = standard); material: Brass, silver plated; made in Italy THIS ITEM IS CURRENTLY NOT AVAILABLE YOU CAN CONFIRM THIS INFORMATION BY CLICKING ON ITEM