dmsolar Solar Module 220w Panels are made with 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 and comes with a 25 year warranty.