TSM Coroplast Correx Poster Corrugated Plastics Sheets Sign Blank Board (24"x18"x4mm.,2-pack/white) A corrugated plastic sheets made from polypropylene Are resistant to moisture and water.Do not react to chemicals and acid. Screen printing can be used as well. Both indoor and outdoor Toughness, resistance to tearing. And for better flexibility,Lightweight,durable and resistant impack well !!! Important, Avoid getting counterfeit items from other seller. Please check if not have a logo on the packaging same as 2nd figure. We usually received complaint from Previous buyers in topic wrong quantity,dimension,color and quality, If your packaging not have a logo please contact amazon customer service.