Designed to fit medium and small ear canals with increased comfort. The plug is made of a low pressure, soft, smooth polyurethane foam that is self-adjusting for increased user comfort. The bell-shaped design with a wide flange allows easy insertion and removal. Available corded or uncorded. NRR 28dB. Tested to ANSI S3.19-1974 standard. 200 pair per box. Sold by the box.