The shelves are constructed from some simple dimensional lumber from Home Depot. They're 1 3/4" x 1 3/4" and 66 inches tall. The key piece to the design is the simple profile cut out that allows for the shelves to slip in from the top at an angle, as opposed to slid in from the front like a normal shelf - see the photos for detail, but simply put, it's a "G" shape. I used a jigsaw to cut the notches. The key measurement to consider is your overall width of the space you're filling with shelves since they're held in place by pressure alone. Total width should be width of shelf + thickness of both supports (after notched cutout is made). I cut my supports, and then adjusted my shelf width appropriately to get the best fit.