[Plastic material]: The mobile bookcase is made of durable, thickened and reinforced plastic material, the edges are smooth and not rough, providing a safe and comfortable user experience. [With casters]: the bookcase is equipped with casters, easy to move without much effort effort, when you need to secure it, you can press the wheel securing button to lock it in place. [5-tier design]: With large storage space, the removable bookcase can accommodate many books, stationery, water bottles, etc., can hold about 60 books, keeping your study space organized. [Dual Access Design]: You can place the bookcase in the middle of desks or chairs to share it with others, and the appropriate height will not obstruct your view and interaction with your study partners. [Wide application]: The multi-layer bookcase can be used in classrooms, bedrooms, offices, study rooms, dormitories, libraries and other places.