· Threaded chestpiece drum allows rapid conversion from a pediatric diaphragm to an adult bell· Solid Stainless steel chespiece and binaurals· Ultra-sensitive diaphragms for greater amplification and high frequency transmission· Non-chill bell and diaphragm retaining rims for patient comfort· Stainless steel binaurals with double leaf internal spring are fixed at a 15 angle for greater comfort· Extra thick tubing walls minimize extraneous noise· Overall length 28"  · Complete with an accessory box containing the adult bell, two spare diaphragms, and two pairs of eartips· Individually packaged in an attractive gift box with lined foam· Latex-free