The Wayne Carlton's Carlton's Diaphragm Elk 4-Pack includes the Premium Flex(TM) Single Reed, Double Reed, Triple Reed, and 2.5 Reed calls in a Diaphragm Stack Case. Using Wayne Carlton's Premium Flex process-stretching the latex in an exact 180-degree arc while locking it precisely into place-they create the perfect sound and fit. Made with ultra-durable Infinity Latex, the result is longer lasting calls with superior sound and consistency.FeaturesPremium Flex frameInfinity LatexStack case included