B-A deeper bowl than the G. Has a wonderful bottom sound * H (Helleberg)-Relatively straight sides that blend into a concave funnel as it enters the throat. * G (Geib)-Produces a more brilliant sound than the H and works well on rotary valve tubas * F-Like the Helleberg cup in shape but approximately 1/3 more shallow * C--A moderately shallow bowl cup that is ideal for solo performances on Eb and F tubas.