This set of 3 Nesting "U" Shelves makes space utilization efficient & is perfect for displaying your favorite books, collectibles, photos, toys, awards, CD's, videos, decorative items and more. They can be hung with the vertical sides either up or down, according to the effect you want to create. With the vertical sides up, it is like having a built in bookend. With its contemporary walnut finish, they are the ideal accent for any living space. Minor assembly is required. Large: 17 x 4 x 4". Medium: 13 x 4 x 3.5". Small: 9 x 4 x 3".