Tidi® Ultimate Nonsterile Patient General Purpose Drape, 40 x 60 Inch, 1 Case of 100 Instruments Convex barrier shape Nasal Cannulas Convex barrier shape s AFD technology provides enhanced acoustic response: light pressure for low bell type frequency firm pressure for high diaphragm type frequency Extra large bell (1 3 8 diameter) for unsurpassed low frequency response Ultra sensitive diaphragm (1 3 4 diameter) for greater amplification and crisper high frequency response Non chill bell and diaphragm retaining rims for patient comfort Clinician headset boasts reinforcing yoke molded into flexible 22 PVC tubing and stainless steel binaurals fixed at 15ß angle for greater comfort Tubing is soft flexible and made without phthalates Adsoft There are 100 general purpose drapes in a case 40 inches wide x 5 feet long