Soft, slow-recovery polyurethane foam formulation makes E-A-Rsoft FX ear plugs exceptionally comfortable to wear, while providing a high level of hearing protection. It s smooth tapered finish makes fitting easier and helps form a comfortable fit. The flange shape when rolled down serves as a very effective insertion device, this makes fitting the earplug easy. NRR 33dB. Tested to ANSI S3.19-1974 standard. 200 pair per box. Sold by the Box.