Solid cast aluminum frame construction allows for greater durability and strength. The aluminum frame has a one - coat powder finish, which is one of the strongest finishing methods available for outdoor use. Prior to finishing the frames, there is a a five step cleaning process. The cleaning process eliminates all foreign particles that could get under the paint. This construction method is long lasting, easy to clean, and nearly weatherproof. Glass is tempered. Replacement glass is available through the design center.