Bookshelf 3 Tier 9 Cube Bookcase Storage Display PB Shelving Rack Unit Grey. This WestWood 9 cube storage unit is ideal for any room needing extra storage space. It's designed as a practical and versatile piece of furniture for a scope of storage functions. Made of 16MM high-quality particle board, it is sturdy and lightweight. The modern design makes it look stylish in any home interior, either as a single piece or to complement a living room suite.