MDF Board and Iron FrameThis rack is made of MDF and an iron frame, which is stable and durable.Adjustable FootpadsThe footpads can be adjusted slightly so the storage rack remains stable even if the floor is uneven.Tipover Resistance Device2 anti-tip devices are included in the package. Cross BarThe large X-shaped bracket can keep the bookshelf balanced and stable. Product Dimensions 6 Tiers: 42.7"D x 43.5"W x 81.3"H5 Tiers: 42.7"D x 43.5"W x 65.4"H Room Type Office, Living Room, Bedroom, Classroom, Study Room Assembly Required Yes  Number of Shelves 5 or 6  Material Metal and P2 grade MDF board, Engineered Wood, Iron  Shelf Type Corner Shelf  Shape L-Shape  Style Industrial  Age Range (Description)  Adult