Product Information: A4 (297mm x 210mm), Single Wall Board (approx 2mm thickness). Pads are made with a 2mm manufacturing tolerance. Packaging Shack’s Cardboard Sheets are great for use as dividers, in craft projects or adding rigidity to items being sent in the post. Made from sturdy Single Wall corrugated, these sheets offer maximum rigidity with minimal profile. For Custom Sizes please message us with details on how many sheets you require and how large they need to be. We’ll get back to you with a quote.