Retractable Organization - Adjust the length according to the number of books, the Retractable Bookend can be extended up to 19 inches in length. The color is , making the desk more neat and orderly, and comfortable.Detachable Pen Holder - With a removable pen holder design, this Desktop Bookshelf Organizer can hold both books and pens. It can be installed on either side of the bookend. Store small items such as writing pens, rulers, etc.Book Classification Storage - Keep your desk clutter-free by organizing books into the 3 included compartments. This Desk Adjustable Book Organizer is lighter and more space efficient than traditional bookends.Wide Application - The -piece Expandable Bookend can be placed anywhere you want, such as bedroom, bedside table, living room, etc. Its base is more stable and secure than two-piece bookends and it can hold larger and thicker books.Durable Material - The Adjustable Bookends are made of ABS, which is environmentally friendly, sturdy, and stable. Rounded corner design, no edges, and corners, not easy to hurt hands. The pen holder is made of PP. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.