Super Leight USA Single-Use Foam Earplugs offer optimal hearing protection by featuring a Noise Reduction Rating (NRR) of 33. The pre-shaped, contoured foam is designed to fit almost any ear canal for comfortable all-day wear. A closed-cell outer layer prevents dirt from building up, while the bell shape will ensure maximum noise reduction and slip resistance.Features : Noise Reduction Rating 33 dB Polyurethane Foam Enhances Comfort Soil-Resistant