Features: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 the clear and crisp transmission of sound. The Clinical I 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.