Durable Material: The thick metal material of these bookends is difficult to deform, providing a robust, stable, and solid construction. Odorless with great elasticity, and a refined finish ensures long-lasting use. Telescopic and Adjustable Size: The normal size of the bookends is 23 x 17 x 17 cm, with a single line thickness of 4mm. The compressed size is 3.2 x 17 x 17 cm, and the extendable width of each section is 2.5 to 6.5 cm, capable of holding thick or thin books. Office Organizer: This bookend expands into 7 compartments to organize your messy books and documents, giving you quick access to frequently used files. A highly effective and space-saving library solution. Wide Range of Uses: These bookends are suitable for placing books, magazines, documents, cookbooks, manuals, notebooks, cards, DVDs, and CDs. Perfect decoration for your bedroom, office, library, bookstore, kitchen, etc. Perfect Gift: These metal bookends are practical and useful for your friends, colleagues, classmates, and family. A great aid in improving students' learning efficiency and creating a dynamic and elegant reading environment.