Maintenance-free photoluminescent plastic chains are visible in daylight and eye-catching in the dark. These sturdy plastic chains are used for indoor use to guide pedestrian traffic through lobbies, museums, theaters. These crowd control chains also help block off restricted areas. Can be used for temporary outdoor applications. Chains are made of injection molded plastic and are 1/4" thick. Yellow photo-luminescent portioning offers 55/8 luminance. 2.75 times brighter than ASTM E2072-04 / ASTM 2073.02 grade. Exceeds DIN 67510. Sold per 3 feet.