MB1
Cup: 32.5mm Rim: 8.0mm
Throat: 8.30mm

MB2
Cup: 32.0mm Rim: 8.0mm
Throat: 8.5mm

MB2-XL
Cup: 32.0mm Rim: 8.0mm
Throat: 8.5mm

MB3 – Grezzy
Cup: 31.55mm Rim: 8.0mm
Throat: 9.0mm

MB4
Cup: 31.70mm Rim: 8.00mm
Throat: 8.30mm

MB5 – Cattanach
Cup: 33.0mm Rim: 8.0mm
Throat: 8.30mm

MB6 Goliath
Cup: 33.50mm Rim: 7.75mm
Throat: 8.30mm

MB7 lake Monster
Cup 33.50 Rim 7.75 mm
Throat : 8.90mm
The largest mouthpiece created by M&B, developed with the Tuba team at the Five Lakes Silver Band from Michigan in the USA, really opens up that pedal register