Virco's hard plastic chair desks constructed of durable hard plastic give you the added strength and long-lasting color of "Martest 21" surfaces on seats, backs and writing surfaces. These high-quality chair desks feature a 1.125-in. tubular steel frame, as well as a welded-on bookrack with durable steel rod construction. The writing surface is 18-in. x 24-in. work surface, and the 3400BRM features a 4-leg design.