Plastic, Steel Pack of 2: Provide pupils with proper seating while they engage during lectures. Perfectly sized for adults this stack chair is ideal in adult education classrooms and training rooms. Student stack chair stacks up to 12 chairs high High density polypropylene comfort-molded seat shell with UV, heat and cold protection Non-corrosive chrome plated frame finish, 18 gauge steel frame, self-leveling floor glides PRODUCT MEASUREMENTS: Overall Size: 20"W x 19"D x 30.5"H; Seat Size: 15.5"W x 14"D x 18"H; Back Size: 15"W x 14"H