For use with BTE hearing aids. The Temporary Foam Ear Molds work just like foam ear plugs but with a tube through the middle to get sound from a BTE hearing Aid into your ear. Great for Hunters and others that want enhanced hearing sometimes. Get A Starkey B13 and a pack of Temporary Foam Ear Molds and you are ready to hear better than ever before. This product needs trimmed to ear size after the BTE is hooked over the ear.