Suitable for indoor use only. The info column allows 2 posters to be displayed on each sides using the integrated "Poster-Snap" clamp rails. Posters can easily be changed. The back panels are made from white polystyrene panels which sit in the grooves of the silver anodised "Quattro" uprights. To protect the posters, 4 anti-reflective UV-stabilised cover sheets are included. The sturdy base of this innovative display is made of steel.