Clear plastic, with soft inflated cuff and fold down top, designed to fit adult or child No assembly required Patented BLS One-way Valve with biological filter - allows no backflow of air or contaminants from patient to rescuer - over 99% bacterial and viral filtration efficiency Anatomical shaped cushion design for air-tight fit Meets all clinical and technical requirements, i.e. flowrates, tidal volume and volume pressure ratios Not affected by extreme temperatures Standard 22mm fittings - can be used with any resuscitator or bag mask Compact carrying case - Many colors and custom graphics available 100% disposable mask and valve Latex free