Canadian Brass Heritage designed by Perantucci MB-83, tuba mouthpiece, cup Diameter: 32 mm, medium deep funnel, Rim: 7,5mm, fairly sharp inner edge, moderately round rim, bore: 8,6 mm, silver plated. The Canadian Brass MB-83 offers players who prefer a moderately wide cup a distinct but dark sound in all registers. The sharp inner rim provides quick response. It is designed for use with the CC and BBb tubas.,