Minimum order 10. Yard signs are made of Coroplast (4mm), which is a type of corrugated plastic that is a light-weight, tough material making it ideal for both indoor and outdoor use. Common uses of yard signs include political signs, directional signs, and event signs. Stakes are included. (Flutes are the open channels inside the corrugation.) (Print-ready art is needed). Single color, 2 Color, and Full Print. Call or Email us for an Quote.