20pcs A4 Corrugated Cardboard Sheets, Hardboard Brown Kraft Sheets Thick Large Sheet 21x30cm for Diy Crafts Arts Painting Modeling Packaging Mailing

Standard Sheet Dimension：This 21 × 30 cm a4 corrugated cardboard sheets adopts three layer brown kraft board construction. It delivers reliable support as box inserts and protective backing for packaging and craft tasks Robust Composite Structure：Built with bonded yellow board layers, these brown kraft sheets balance stiffness and flexibility. They offer moderate cushioning without excessive weight for daily handling and transport protection Simple Processing Feature：This large cardboard sheet works well with scissors and cutting tools. Users can cut, fold and glue the sheet conveniently to build models, artwork supports and custom packaging parts Recyclable Safe Material：Manufactured from natural yellow kraft board, this kraft hardboard is recyclable and free from harsh additives. It suits home, school and office use for student crafts and shipping protection Multi Scene Practical Use：The flat cardboard serves handmade creation and parcel protection. It works for model building, picture backing, shock padding and assorted DIY handmade projects