... steel ball of 4.5kg and its anti-aging tested by accelerated ageing test showing 15-year life time used outdoor—8 ... installed outdoor long time. It is anti-corrosion, anti-aging, even better than steel. The brackets include front strip, ... Excellent FeaturesAssembled flexibly and continually.Wind resistant, impact resistant, anti-aging, anti-corrosion, easy mantainance, easy installation, low noise, UV ...