Size: about 17 x 2.2 x 2 inches. It can hold more books, as well as rulers, board erasers, and more. It is packed with bubble film and a paper box to greatly reduce the risk of damage during shipping. Super Magnetic: This magnetic book shelf for classroom uses a larger and thicker magnetic strip (size: 17 x 1.6 inches) with strong adsorption capacity, load bearing up to 8.8 lbs (4 kg). It will not fall off during use, offering solid and reliable performance. Premium Material: Made of thickened acrylic, these shelves are lightweight yet sturdy and easy to clean. They are a durable choice that won't easily break, making them a practical solution for staying organized in the classroom or at home. Easy to Use: The magnetic book shelves for whiteboards attach directly to smooth magnetic surfaces. Before use, please tear off the protective film on the surface. Use scenarios: - Classroom organization: mount on whiteboards or other smooth magnetic surfaces to hold books, notebooks, rulers, and erasers within easy reach for students and teachers. - Home study area: keep study materials, rulers, and small supplies neatly arranged on a magnetic surface for quick access. - Library or office spaces: use on metal whiteboards or magnetic surfaces to organize reference books and frequently used accessories.