The M series of Studio Master mouthpieces are the longest of the Studio Master line in terms of overall length as well as the deepest. These include the VM, VMS, XM and XMS.
The M models are great crossover pieces. They are available in two different depths (MS/slightly shallower than M) and two different back bores styles (X slightly tighter than V). The cup depth is right down the middle of the spectrum from shallowest to the deepest we offer.