Sta Dri® Knee High Boot Cover, 1 Pair Manual Inflate Digital B P A universal lock providing security 16 7136 A universal lock providing security and preventing unwanted access to collectors Combination adult size chestpiece precisely machined to exacting tolerances from surgical stainless steel for outstanding performance and rugged durability * Extra large bell (13 8 diameter) for unsurpassed low frequency response * Ultra sensitive diaphragm (17 8 diameter) for greater amplification and crisper high frequency response * Color coordinated non chill bell and diaphragm retaining rim for patient comfort * Stainless steel binaurals with double leaf internal spring fixed at 15ß angle for greater comfort * Reinforcing yoke molded into flexible 22 PVC Y tubing * Adsoft deluxe PVC eartips (in small and large) for the ultimate in wearing comfort and acoustic seal * Spare diaphragm included * Scope ID Tag included * Weighs 6 Impervious film and heat sealed seams prevent leaking and keep you safe from blood borne pathogens Comfortable