CPR Rescue Mask,50 Rolls, 36pcs in one Roll, Description: Each piece mask size:29.5x19cm, there is a round size non-woven fabric membrane on center, it can resist water and saliva, but allow air ventilate. When use on emergency artificial respiration, this mask can prevent disease as AIDS transmit and infect. 36pcs mask in roll, each piece can be disparted easily, packed in paper box, non-sterile.