Block is a modular shelving system available in a variety of different finishes and heights. This one is a 15" expansion shelf that comes as pictured. Use it with the starter kit. See those pages or let us help you configure a shelving system you need.This modular product line gives you the flexibility to build a shelving system that will fit your space. Use this piece to add onto the starter bookcase in two widths - see the starter shelves available. There are also storage boxes that slide into the cubes.Features:Timeless, geometric, and balanced designAvailable in fixed compositions or separate module pieces2 year warranty against product defectsAssembly required: YesMade in EuropeMaterial: durable melamine outer, interior engineered honeycomb wood structureFinish: matte whitenatural walnutfaux-concrete Dimensions: Overall: 15" wide x 13" deep x 88" highCompartments dimensions: 13" H x 13" W