PC 1809 - Triple Hoop The 9' Post R35 shall be fabricated using 3.5" O.D. 11 gauge steel tubing. The Cap & Plugs shall be made from high density 3/4" sheet plastic specially formulated for optimum UV stability and color retention. The Triple Hoop shall be constructed of UV-stabilized, rotationally molded, linear, low density polyethylene with an average wall thickness of .250".