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A4 corrugated cardboard sheets crafted from sturdy 3mm single-wall corrugated material. These 210 x 297 mm kraft board sheets provide maximum rigidity and structural strength for packaging, mailing, crafting, and protective storage applications. A4 rigid Backing board for prints are premium 3mm thick single-wall corrugated construction with 3 layers of durable kraft board. Designed to offer exceptional stability and crush resistance while maintaining a lightweight, easy-to-handle profile for all your project needs. A4 Cardboard Divider is versatile protective inserts perfect for separating prints, artwork, photos, postcards, and magazines during mailing. Also ideal for flower pressing, welcome signs, photo frames, and office organization projects. Standard A4 dimensions measuring 21 x 29.7 cm (8.3 x 11.7 inches) providing ample surface area for school projects, dioramas, display boards, craft boxes, and creative DIY applications. Manufactured in Britain from high-quality, 100% recyclable corrugated kraft board. The traditional brown finish offers a natural, professional appearance suitable for practical packaging and creative crafting projects.