Adult size chest piece Precisely Machined to exacting tolerance from surgical stainless steel for outstanding performance and rugged durability. Extra Large bell for unsurpassed low frequency response. Ultra - Sensitive Diaphragm for greater amplification. Color coordinated Non-Chill bell and Snap on Ring to retain diaphragm for patient comfort. Deluxe PVC ear tips for the ultimate in wearing comfort and acoustic seal. Spare Diaphragm for patient comfort. Custom moulded 22" PVC "Y" Tubing. Including ID Tag. Three Year Warranty.