Plastic When considering school seating for early childhood centers this plastic school chair should be at the top of your list with its safety design. Pair with our plastic height adjustable activity table for ease of maintenance around messy kids. Stack quantity: 10, static load capacity: 154 pounds Contoured one-piece polypropylene shell, no metal parts eliminate pinch injury Ideal use in the classroom, daycare, preschool, homeschool, after school centers PRODUCT MEASUREMENTS: Overall Size: 12.5"W x 14"D x 20"H; Seat Size: 10"W x 10"D x 10.75"H; Back Size: 11"W x 10.5"H; No Assembly Required