ADC Adscope 606 Ultra Lightweight Cardiology Stethoscope with Tunable AFD Technology, 28 inch Length, Black Combination chestpiece is CNC machined to exacting tolerances from ultra-lightweight aluminum alloy; total weight: 4.5 oz. Extra-deep bell for unsurpassed low-frequency response, ultra-sensitive diaphragm for greater amplification and crisper high-frequency transmission. Now with AFD technology for enhanced acoustic response: use light pressure for low frequencies, firm pressure for high frequencies. High-performance cardiology headset features large-bore aluminum binaurals and Adsoft Plus snap-on silicone eartips for the ultimate in wearing comfort and acoustic seal. Lifetime warranty and free "consumables," including diaphragms and eartips, when registered. Ships with two additional pairs of Adsoft Plus eartips and a complimentary scope ID tag.