HOWARD LEIGHT MAXIMUM-1 MAX EAR PLUGS DISPOSABLE NRR 33 UNCORDED 200 PAIRS/BOX MAXIMUM PROVIDES SUPERIOR NOISE-BLOCKING PERFORMANCE IN A SINGLE-USE EARPLUG. THE WORLD'S MOST-USED POLYURETHANE FOAM EARPLUG. CONTOURED BELL-SHAPE IS EASIER TO INSERT RESISTS TENDENCY TO BACK-OUT OF EAR CANAL. POLYURETHANE FOAM ENHANCES COMFORT ESPECIALLY FOR LONG-TERM WEAR. SMOOTH SOIL- CLOSED-CELL FOAM SKIN PREVENTS DIRT BUILD-UP.