These one size fits all earplugs feature Microban® antimicrobial protection to help control bacterial growth. Re-engineered PVC formula results in higher density foam construction with improved cell structure. Students benefit from better ear canal fit and excellent noise reduction. Deciguard AB earplugs are lightweight, nontoxic and nonirritating. They are disposable and are packaged one pair per cellophane pouch to eliminate contamination from dust and dirt.