With the highest Noise Reduction Rating available in a single-use ear plug Howard Leight by Honeywell Super Leight General-Purpose Disposable Foam Earplugs offer excellent hearing protection for loud environments. Using a specially-contoured shape these earplugs insert easily and expand to fill your ear canal for a more customized fit. The low-pressure polyurethane is gentle on your ear canal and the smooth closed cell exterior helps prevent dirt buildup. Bell shape provides a comfortable fit and easy insertion; contoured design is easy to insert and resists tendency to back out of ear canal Soft polyurethane provides long-term comfort Noise Reduction Rating: 33 Contoured to match inner ear for secure fit