Steel Our popular plastic stack chair is a staple for your classroom to provide comfort to your pupils. With an ergonomic waterfall seat shell and durable powder coated frame, this chair will hold up during the school year and beyond. Ergonomic multipurpose stack chair, durable polypropylene material, black powder coated frame, plastic floor glides Design: stacks up to 20 high, 880 lb. static weight capacity, fully assembled, compatible with our banquet chair / stack chair dolly Suitable for: training rooms, waiting areas, offices, schools, churches, business centers PRODUCT MEASUREMENTS: Overall Size: 19.25"W x 23.5"D x 32"H; Seat Size: 17.75"W x 15.5"D x 17.75"H; Back Size: 17"W x 15"H; No Assembly Required