Metal MaterialHeavy duty metal bookends made of sturdy metal and advanced technology, strong enough to support books neatly, upright and not easy to bend. Perfect for storing large books, DVDs, video games or CDs Rubber Anti-ip BottomThe bottom is filled with rubber, place them on your favorite shelf and they won't damage the surface at all. The corners are ightly rounded so they won't scratch your fingers or booksHigh Performance Black Bookshelf measuring 4.7 * 7 * 4.7 inches, it can hold a variety of book sizes, no matter how many books you place. These book stop support kits can easily and neatly support your books to keep your desk neat and tidy, as well as avoid mess and improve office efficiency. Another great advantage of the Simple Bookstop is the space saved on the shelf, as there is no extra end sticking out the other side.Elegant designthe bookshelf is designed with an openwork tree shape that not only supports your books, but also decorates your desk or bookshelfGood GiftBooks are an ideal gift choice for students, nerds and office workers. If you have any questions about your purchase, please feel free to contact us and we'll do our best to make it right.Heavy-duty metal bookends