【20 Sheets of Standard A4 Size for Versatile Use】 Each set includes 20 standard A4 cardboard sheets (297x210mm) with a thickness of 1.8mm. Their precise dimensions and flat design allow for easy storage under beds or in cabinets, saving space while ensuring convenient access whenever needed. 【Three-Layer Corrugated Structure for Superior Protection】 The brown craft board features a sturdy three-layer corrugated construction, offering exceptional strength and cushioning. It effectively resists compression and impacts during transit, providing reliable protection against bending and scratches to ensure your items arrive safely. 【Eco-Friendly Recycled Material—A Sustainable Alternative to Plastic】 Made from recycled paperboard, this corrugated board sheets is an environmentally conscious substitute for traditional packaging materials like bubble wrap and foam plastics. Its biodegradable nature significantly reduces environmental impact, meeting modern consumers' demand for green packaging solutions. 【Easy to Customise and Craft—Unleash Your Creativity】 The cardboard panels is easy to cut, fold, paint, and emboss, and works well with markers and adhesives. Whether you're creating models, signage, or art projects, it enables seamless realisation of creative ideas—making it an ideal choice for DIY enthusiasts. 【Versatile Applications—Practical and Creative Uses】 Ideal for protective packaging, this cardboard also suits a range of DIY projects such as photo frames, 3D models, and school assignments. It can also be used as drawer liners, display backdrops, or even pet toys, catering to diverse household and creative needs.