The dmsolar 220W Solar Module is made of high-efficiency mono-crystalline solar cells embedded in transparent vinyl acetate behind tempered glass with heavy backsheet ensuring maintenance free performance. Heavy duty corrosion-resistant anodized aluminum frame and weather-resistant junction box with pre-mounted MC cables ensuring dependable performance and easy installation or maintenance. High-Impact tempered glass to resist hail, Ice, flying debris or force wind. Comes with the industry standard 25-year power warranty.