The CPR MicroShield was designed to protect the rescuer and allow the rescuer to perform proper CPR according to the established guidelines and procedures. The one-way valve and single piece design will ensure that the barrier will not leak and will maintain its integrity when a rescuer is performing CPR. This shield will reduce the risk of cross-contamination and is made of a clear medical grade vinyl. Each MicroShield comes complete with instructions. Having a MicroShield in any first aid bag is vital when performing CPR.