The NIAGARA 4 Leg Stack Chair provides a comfortable and flexible student seating solution with classic styling and long-lasting construction. Shells are created from heavy duty and static free, high-density polypropylene material with a light grain texture surface on both sides which is injection molded into a one-piece shell with waterfall edge. The ribless back design provides comfort and flexibility and the ergonomically designed opening in the shell back provides added comfort as well as a handle grip. The shell is attached to the frame with steel rivets underneath the seat, which offers no exposed hardware on the surface. There are many colours and options available including Bookrack, Casters, Padded Seat, Band Pitch, Steel Glides, Felt-Tip Glides, Qball Glides, and Boot Glides.