FEATURES UL STYLE""MARGIN-TOP0PX;PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" 100 PVC-FREE. HIGHEST INDEPENDENTLY TESTED NRR 33. EXTRA-SOFT LOW-PRESSURE FOAM FOR COMFORT AND FIT. TAPERED SHAPE FOR EASY INSERTION AND REMOVAL. SHAPED TO FIT EVEN VERY SMALL EAR CANALS. NON-IRRITATING SMOOTH SURFACE.