Heavy Metal Bookmarks: The overall size of the bookshelf is 4.7 x 3.6 x 7.0 inches (12 x 9 x 17.5 cm) and is made of advanced technology sturdy metal that is strong enough to hold books neatly and upright and not bend easily. Perfect for placing large books, house DVDs, video games, or CDs.Non-slip foam pad design: There are 4 non-slip foam pads at the bottom of each book to prevent the bookshelf from slipping, they move your bookshelf but do not scratch the table. The corners are slightly rounded and won't scratch fingers or books.Durable, rust-resistant material: Made of sturdy metal with advanced technology, it is durable enough to hold large and heavy books neatly and upright, and is not easy to bend. The powder coating surface is smooth and rust-proof.Beautiful design and great gifts: INNplus elegant and minimalist design book for offices, schools. A great gift for avid readers and bookworms. Bookshelves keep books neat and upright while serving as a good decoration.Quality Storage Assistant: It helps you organize and organize your books to make your desktop look neat and organized. Perfect for schools, offices, families, etc.