Ad-Hear Cerumen Guards act as an adhesive bandage to protect your hearing aid from cerumen (wax). Made from medical-grade materials, the guard has a unique ultrafine foam that is totally clear to sound, but is excellent at catching debris. It has a special adhesive that sticks well to a clean and dry hearing aid. For easy and practical handling, it has a novel paper tab. Like an adhesive bandage, the guard shows you when it needs changing, and you replace it yourself with a fresh, clean one.