The top shelf is black walnut, the other two shelves are made from the wood pylons that are used to hold up guard rails before and after bridges and overpasses. On the bottom shelf is the coding that was stamped on at the manufacturer. Holding the shelves together is black pipe. Whoever buys the shelving unit will also get all the black pipe pieces that I have. This would allow you to configure the shelving however you would like or if you would like to use the pieces to construct another set of shelves or whatever. Please message me if you have any questions.