The netting is made from U.V. stabilised polythene which has a life of 10+ years. A variety of mesh sizes are available, 3/4" for sparrows, 11/8" for starlings and 11/2" and 2" for feral pigeons.
The nets are attached to a 2mm perimeter straining wire which is supported by fixings drilled into the stone work. The wire is tensioned using barrel strainers and the net is attached to the wire using hog rings.
The straining wire, fixings and hog rings are available in galvanised steel or corrosion resistant 316 grade stainless steel.