Zambelli half round gutter is manufactured from prime 24ga steel with a zinc-magnesium alloy coating for superior corrosion resistance, then painted using Zambelli’s proprietary paint system inside and out and features a 15-Year non-prorated materials warranty. Available Finishes:  Standard: Dark Bronze, Black, White and Dark Charcoal. Metallic: Natural Gray Metallic. Un-Painted: G-120 Galvanized