Carltons Premium Flex Diaphragm Elk Call -Wayne Carlton's Calls® diaphragm calls feature long lasting Infinity Latex® and Premium Flex™ frames for consistent stretch and sound. Creates natural elk sounds. Calls feature long lasting Infinity Latex and Premium Flex frames for consistent stretch and soundOne thin Single Reed creates great young cow moos and calf vocals.Double Reeds create mature bull bugles2.5 Reeds create mature cow vocals and bull buglesTriple Reeds create great aggressive herd bull buglesThe Cow & Calf has 1.5 Reeds that create authentic bull bugles