50 Blank Signs White 18x24 inches BLANK SIGN - Great for any event. Add your own message in permannent marker or paint. OUTDOOR SIGN - Corrugated Plastic 4MM Sign Blanks 4mm Corrugated Plastic BLANKS. VERY reasonable price! Corrugated plastic is also great for single signs and craft projects. This material is sturdy, weatherproof and reusable. Great for yard decorations, from high-quality materials for elegance and extra durability for reusable, waterproof outdoor use. 4mm high grade corrugated plastic blanks sign is durable and reusable. Use for indoor or outdoor use - Waterproof and Wind Resistant! Display in your lot, front yard, lawn, garden or any area with grass! Great for garage sales, parties, businesses, arts, kids craft project or events,lawn signs. 4mm Corrugated Plastic Sign Blanks Yard Signs, Lightweight 4MM White Short Flute Sheets, Great for Display and Packaging Great for UV Flatbed and Screen Printing, Yard and Cut-out Signs