I built this rack for my office to hold my stereo and TV in my office. The posts were made by laminating two 8x36 pieces of 4/4 Mahogany I found at the WoodCraft store. The shelves are made from 1/2 MDF with ribs cut from 3/4 MDF. As you can see by the sagging shelves in the photograph this was a design mistake. To make the shelves stiffer I have updated the design to use more ribs made from 3/4 plywood. The shelves are laminated with black matte Formica. The second design mistake was attaching the posts to the shelves with hanger bolts, this made for a nice aesthetic look, but caused the rack to wobble. This is solved in the updated design by adding cross pieces between the side posts.