prodct used for windows made by Zinc alloy/ aluminium alloy. surface treatment Powder coated(white/*****)can be produced according to costomer requirement please visit my website from my company page if you insterested in some of our products, please inform me the ART NO., like B003 B009, and inform me the material requirement and weight requirement, because clients have diffrent requirement of the material and the weight. if you do not find the products you want to buy, please send me a photo and inform me material and the weight, so i can quote you the price.