The configuration of this bookcase set fit the space I had and has the right amount of storage for my purposes. This product is made of a particle board material with a wood grain veneer on it. The light color "oak" finish I received appeared to have more grain texture than in the pictures. The shelves are quite sturdy, but are not adjustable because they are part of the structure and strength of the unit(s). They were relatively easy to assemble, but having a second set of hands available when connecting the lower sections with the upper bookshelf sections was extremely helpful.