Street Pole Banner Spring Mounting Bracket/HardwareThis state of the art spring loaded mounting hardware system is designed to withstand all the elements. The base is made of rust proof cast aluminum accompanied with fiberglass arms. These spring tensioned assemblies respond to winds quickly, flexing with the wind vertically and horizontally to dramatically reduce the wind load on banners by spilling some of the wind load off of them as the fiberglass arms flex. Sometimes referred to as boulevard pole