Heavy-Duty Aluminum Construction, Rust-Proof & Long-Lasting Made of solid aluminum alloy, no rust, no rot, no cracking. Withstands sun, rain, frost and coastal salt spray. Service life over 20 years — far more durable than plastic or wood edging. Flexible Design for Straight & Curved Borders Bends easily by hand to follow any landscape contour — straight lines, gentle curves, circles or irregular flower bed shapes. No special tools needed, holds its shape once installed.