all particle board material, which is fine except that every unit I ordered (I bought 4 of these) had a fair amount of damage.  In particular the tops were all warped or cracked.  I am not too happy with this purchase but it is an effort to return,  Plus I needed to build these out for a wall library and timing to return and get new product would be an issue.  I just built new tops made from solid wood and painted the other chips.  On the plus side, it was really easy to put together.  

Pros: easy to assemble
Cons: damaged