We use Ameristar welded steel ornamental fence products for our "montage" or black steel fences. The galvanized steel framework has a 4 layer E-coating to significantly increase corrosion protection and provide protection against adverse weather. Montage fencing gives you the decorative look and strength of wrought iron without all the maintenance and rust. All Ameristar Montage fences come with a 20 year warranty. Standard montage comes is a 4 inch airspace but 3 inch is also an option for smaller sized dogs.