Winsome Wood''s new Bailey collection of leaning home office furniture in black finish is contemporary and compact. The 5 tier shelving unit can stand alone or be paired with the desk in a modular fashion. The shelves range in size from 13.5 (bottom) - 4.0" (top) deep and are 23" wide. Constructed of wood, is sturdy, durable, and can be matched with Leaning Desk# 29330 and Airlift Stool # 93329 for a complete workstation. Overall Shelf size is 25.75"W x 14.4"D x 74.6"H. All shelves are 23" wide with a gradual depth increase starting with the 1st Shelf = 4", 2nd Shelf = 6.5", 3rd 8.8", 4th = 11.2", 5th = 13.5". The distance between each shelf is 14.4". Made of solid and composite wood. Assembly required.