From the Manufacture: Our Ear Plugs are designed to provide you with all day comfort while working on the job site. The soft comfortable foam expands quickly in your ear for a secure seal to protect against hazardous noise. The noise reducing ear plugs are designed with a tapered shape to comfortably fit inside your ear canal, providing you with a Noise Reduction Rating (NRR) of 32db. Individually sealed pairs of foam earplugs are available in bulk, allowing you to easily distribute them on the job site.1