Premium Material: Our yard signs are made of sturdy 4mm thick corrugated plastic board. Yard signs can withstand any bad weather, waterproof, wind-resistant, and moisture-proof, durable, not to tilt and fall. The H-stakes is made of galvanized steel, which can prevent rust and ensure year-round use. Custom Yard Signs: Blank yard signs are double-sided and easy to read, so you can see the content from any direction. The surface of the yard sign is treated with an electroplating process, which makes it easier to write and change quickly. The yard sign supports waterproof paint pens, erasable markers or vinyl stickers.