MICROTEK MEDICAL INC.CPR MICROSHIELD® Mouth BarrierMouth barrier for mouth-to-mouth resuscitation is ultra compact, packaged in an orange envelope-style case. Positive one-way valve inside the airway enhancing bite block is designed for maximum protection of the first responder. Also assists in keeping an open airway while performing the head-tilt, chin-lift maneuver. Features a clear, flexible barrier and 1 3/4" slim ventilator tube with a one-way valve to prevent backflow during resuscitation. Features: • Positive One-Way Valve • CPR Compatible • True Mouth-To-Mouth Seal • Airway Enchancement • Clear Barrier • Airway / Shield Welded