1.metal safety sign 2.fireproof and high quality luminous 3.long time ... no harm, no radioactivity, no heavy metalsseries photoluminous safe signs:road instruction signs, road safety signs, ship safety ... , aluminum alloy, stainless steel, ABS plasticsizes of photoluminous safe signs:120mm*340mm, 150mm*400mm, 200mm*450mm, 250mm* ... light, to dark people with information instructions fireproof exit signs