The Boss Office Products B1400-BK-5 Black Stack Chair With Chrome Frame provides comfort and simplicity in an economical package. The 18.5" W x 18" D seat accommodates most sizes and sits at 18" H. The back measures 17.5"W X 12.5"H and features an opening designed to make transportation and stacking easier. Its black polypropylene seat and back and solid chrome frame offer exceptional durability and strength. However, its durability does not come at the expense of comfort as a sculpted seat back lends superior lumbar support. This chair may be stacked 16 high on a Boss model# D100 black polished steel dolly with casters.