Fox C Bocals are our basic student bocal. They are the bocals provided with our Renard models 51, 41 and 222. C bocals are made with a brass tube plated with nickel. C bocals are available in lengths 0 through 4, with 0 being the shortest. Lengths 1, 2 and 3 should be considered the "normal" lengths. If you do not know what length you need the #2 is probably your best place to start. In general, the extreme lengths 0 and 4 should be avoided without a good justification. Fox C bocals are popular as a replacement bocal for school use with most makes of bassoons.