High performance and outstanding acoustics are the hallmark of the Clinical I?. By using a stainless steel chestpiece and stainless steel binaurals, the Clinical I? incorporates the most effective sound conducting metal available. The Extra Thick Walled Single Tubing? with an inside alloy sound conductor assures crisp sound. Includes two sizes of eartips which seal out extraneous noise while providing superior comfort. An easy to use snap-on rim and diaphragm help to make the Clinical I? an outstanding performer. Extra diaphragm included. Lifetime Limited Warranty.