... Square Rods, Fiberglass Square Poles: used for plant holders/vine stake (tapered), flagpoles, curtain poles, umbrella rib. FRP Square Rods, Fiberglass ... Square Poles FRP rods are of long service life, light weight, high ... Fire Retardant -Dimensional Stability -Attractive, Design Flexibility FRP Square Rods, Fiberglass Square Poles