Welcome to Elysaid’s shop ， We are there provide the most professional first aid kit for training . Feature: 1- Way Valve CPR Mask. The CPR Mask was packed in a Keychain bag. It is compacted in shape, can be placed into any first aid kit and carried easily. It will low resistance unidirectional valve and water filter are combined to block fluid and secretions, valves and filters together played a barrier to rescue personnel and sick isolation. Specification: Keychain Bag Material: Nylon CPR Mask Material: Food-grade PE CPR Mask Color: Transparent Keychain Bag Color:Black ,Red,Blue，Orange，Yellow，Green， Use: To the casualty in doing mouth to mouth artificial respiration, avoid contact with the patient's mouth, nose and face.