Never lose your earplugs again with Range Plugs featuring integrated cord and clip. These Range Plugs have a tapered shape and are made of polyurethane foam to make them easy to insert and comfortable for hours of use. The cord can be used in conjunction with the provided clip to snap on the back of your hat or the collar of your shirt, so you always know where your ear plugs are. 31dB Noise Reduction Rating. 31NRR Rating? Tapered design makes the plugs easy to insert? Polyurethane foam makes the plugs comfortable to wear? Cord and clip make it extremely easy to keep track of? Screw cap bottle makes storage of unused plugs extremely convenient