White Plastic Folding Chairs, Sold In Boxes Of 4Plastic folding chairs are a favorite of party rental companies across the U. S. The molded polypropylene and hardened 18 gauge steel make these some of the strongest chairs available. You will get the best return on your investment with these chairs, as they are electrostatically powder coated to resist rust and withstand plenty of abuse. Tough, Lightweight Plastic folding chairs Shaped poly backrest "gives" ever so slightly provides a lot of comfort