pc: Mouthpiece makers use their own graduated designations to designate their tip openings relative to other tip openings among their own pieces. For instance, Selmer's C* is not as open as their C**, D, E, etc.
One maker's tip-designation has no relationship with another maker's tip-designations. For instance, Links use a numerical designator like 6*, 7*, etc. Selmer uses letters like C*, D, F, J, etc.
One needs a chart to identify the measurements and to compare one maker's D to another maker's 6.
WW&BW prints such charts in their quarterly catalogs. I think there are charts available on the Internet, but I don't know their addresses. DAVE
One maker's tip-designation has no relationship with another maker's tip-designations. For instance, Links use a numerical designator like 6*, 7*, etc. Selmer uses letters like C*, D, F, J, etc.
One needs a chart to identify the measurements and to compare one maker's D to another maker's 6.
WW&BW prints such charts in their quarterly catalogs. I think there are charts available on the Internet, but I don't know their addresses. DAVE