Yellow - Sonic welded earloops prevent facial irritation - Designed for use when no fluid contact is expected - Precepts procedure masks combine protection with comfort, to ensure ultimate satisfaction. Masks are constructed of quality materials, including tissue, polypropylene, and cellulose. Enclosed nosepieces are malleable to ensure a snug, comfortable fit. Earloops are constructed from soft, non-irritating material with good elasticity. Precepts procedure - masks are cool and comfortable, allowing for excellent breathability. All procedure mask provide comprehensive protection, with bacterial fi ltration effi ciencies >98%. All masks have Class 1 fl ammability.