20 Sheets 4mm Corrugated Plastic Board, Waterproof Sign Sheet for Indoor/Outdoor

Crafted fromdurable 4mm thick corrugated plastic, these blank sign boards areUV-resistant, waterproof, and won’t warp —perfect for outdoor or indoor use year-round. Includes 20 sheets (18"x24")—plenty forpersonal projects, bulk signage, or resale.