Solid oak-no particleboard-back is oak covered MDF.
The CD storage racks are hand finished with a Watco Danish oil called medium walnut and on the solid red oak wood, it gives you the color of Honey. No two pieces of wood will accept the same stain therefore colors may vary slightly. Tongue in groove joinery (no screws used). Shipped fully assembled. ( On the larger units, you will need to install the feet.)