ReadyMax Zip-Outs provide instant "on-board" hearing protection on your hard hat, installing in seconds with a 3M® peel-and-stick adhesive backing. The ReadyMax patented tethered silicone earplugs inside the long-life nylon Zip-Out will extend for easy insertion into your ear canals, retracting back into place on a 22lb. test nylon retractable cord when not in use. Washable, reusable, replaceable and recyclable and provides NRR 27 noise protection. 6"x1"x1". Weighs .07 oz.