Max single-use, polyurethane foam earplug is the world's most popular polyurethane foam earplug. It offers superior noise-blocking performance, and it's contoured Bell shape is easier to insert and resists backing out of the ear canal, while its softer foam delivers superior long-wearing comfort. Its smooth, soil-resistant skin prevents dirt build-up and helps deliver a NRR of 33Db. Workers who need protecting hearing equipment demand the best protection and comfort available in an earplug - the max. 100 pairs per dispenser.