Size is approx. 4x7x14cm -Hardness: B – Quantity: 40 pieces – Core diameter: 0.5mm – Material: Case: Recycled AS/Cap, Upper Lid, Bottom Lid: Recycled PP – A mechanical pencil lead that is smooth and hard to break. A mesh structure frame is formed with reinforced silica inside the core, and the entire core is supported from the inside, making it strong and hard to break. It adheres well to paper, is resistant to contact with hands and paper, and is resistant to abrasions, so you can write clearly.