The 3000 Series 4-Leg Stack Chairs retain a bright, fresh look semester after semester. They are constructed of colorfast, scratch-resistant, flameproof, Martest 21. Hard plastic seats and separate backs are remarkably chip-resistant. Tubular steel frame in chrome offers dependable support. Nylon glides are ideal for most surfaces. With a 16" seat height, these chairs are recommended for students in third-grade and fourth-grade.