These slotted-back plastic stack chairs are made with a one-piece molded seat and back for a posture-enhancing form. The plastic shell also features three slots for ventilation, rolled edges, and reinforced areas at seat rivet points. The slotted-back design features steel back support for the soft plastic. Welded steel frame includes identical front and rear legs joined to two brackets. The tubular steel back support is welded to the top of the brackets. 1.12" diameter, nylon swivel glides on the four-leg chrome base allow easy sliding.