Module bookcase units utilized in horizontal or vertical applications. Units are 7feetx17inchesx13inches approx. and made with 3/4inch plywood. The walnut veneered units are shown but also available in other colors and wood types.Units are built with screws for flat pack option if shipping is preferred. Price for 5 unit walnut veneered set is 5500usd which included local delivery and installation - metro Detroit