Safe N Simple Fibergel™ Wound Dressing, 1 Case of 160 Commodes 50 milligrams niacin Color:Yellow 50 milligrams niacin Navy Blue 27 * The ultimate acoustical stethoscope * Tunable diaphragm conveniently alternates between low and high frequency sounds without the need to turn over the chestpiece * Handcrafted sold stainless steel chestpiece * 2 in 1 tube design eliminates tube rubbing noise * Portable convenience of a single sided chestpiece * Excellent acoustic seal and comfortable fit with patented Littmann Snap Tight soft sealing eartips * Comfortably angled anatomically correct headset * Patient friendly nonchill rim and diaphragm Gelling action creates an optimal environment for moist wound healing Conforms easily to various shapes