The coreflute signs we provide are single sided, rectangle cut, most suitable for outdoor use. For a rigid indoor sign we would recommend either a screen board or smooth 3mm PVC. We have a several basic construction site signs (600mm x 400mm) in stock at all times. We can design the signs you want for your particular sites including your branding, OHS requirements, specific contacts etc. For a solution to your particular needs call us, or email us for a quote. For the best value try quantities of at least 20 or 100. We have a minimum order amount of $90.00 which applies to all orders (Coreflute, PVC Foam, and Fome-Cor orders).