Every Mueller metal roof is composed of a series of high-quality metal panels. All of these panels deliver premium performance combined with very low maintenance. They're available in many colors, with limited paint warranties up to 30 years. The Mueller Snap Lock - Standing Seam panel is made of 24-gauge commercial-grade steel. The CF, AP, R-Panel, U-Panel and Corrugated Panels are made of 26-gauge commercial grade steel. The panels are fire resistant, hail resistant and wind resistant up to 140 miles per hour. They also give you superior energy efficiency and durability.