Features: 1) Dimensions: 750 x 385mm, 700 x 360mm, 500 x 300mm (also can be produced as requested) 2) Application: used in the places such as highways, parks, airports, stations, ports, and building sites to arouse attention of safety, warning and separation 3) Usage: a) Put on the appointed place b) Be away from the corrosive chemical object such as vitriol and hydrochloric acid, avoiding distortion, aging and damaging