... ISO9001 1)Name:frp sewer grate 2)Material:fiberglass&resin&mixture3)Surface:concave grate,flat grate,gritted grate,grate with covered surface ... and surface with figure,grate with covered surface ... ")4)Advantage:UV resistant,Fire Retardant,Impact Resistant,High Strength,Non-Magnetic,Non-Conductive,Non-sparking,Light ...