Corners are reinforced. Life is approximately 18 months to 2 years. Appropriate for short to mid term applications in moderate climates. Available in 20 colors. Very high quality.
Tubing is galvanized to prevent rust.
Available at Home Depot. Appropriate for light to medium duty applications. If used in snowy environments you must have rafters at least every 5' to prevent collapse. Available at your local fencing pipe contractor. Appropriate for medium duty to heavy duty applications.