Rear back panel is one-piece, injection molded, high-impact HDPE polypropylene Standard poly foam thickness is 2" with option for 3" Available on either cast iron or steel standards Inner upholstry panel is constructed of 5-ply, 7/16" plywood Back wings are formed from 14 gauge steel Available with decorative tufting Back height of 33" with 35" high back version also available Available for use with E-Link and Data System Can be used with the No. 6,7,8 or 12 seats The No. 12 seat is available in 1/2, 3/4 and full fold options and with the choice of ergonomic or suspension support structures All seats components exceed ASTM F-851 test for self rising seats A full range of accessories are available