Threaded chestpiece drum allows rapid conversion from a pediatric diaphragm to an adult bell. Chestpiece precisely machined to exacting tolerance from surgical stainless steel for outstanding performance and rugged durability. Extra deep bell for unsurpassed low frequency response. Ultra-sensitive diaphragms for greater amplification and crisper high frequency transmission. Non-chill bell and diaphragm retaining rims for patient comfort. Large internal bore stainless steel binaurals are fixed at a 15 angle for greater comfort. Custom molded bi-lumen 19" PVC tubing stays soft and flexible. Latex free. Extra thick tubing walls minimize extraneous noise. Double leaf internal spring construction reduces bulk and prevents kinking when folded. Complete with one pair of PVC eartips and ADSOFT deluxe PVC eartips in small and large sizes for the ultimate in wearing comfort and acoustic seal. Complete with an accessory case containing the adult bell, 2 spare diaphragms, and two sets of eartips. Scope ID tag included. Weighs 7.57 oz and 8.57 oz . Overall length 28". Lifetime warranty.