Material : 100% All Aluminum Magnesium Alloy. 1: There might be slightly difference in color, because of the computer monitor settings. 2: With the difference in the measurement method, please allow 1-3cm in size deviation. 3: Some products surface are covered with a layer of protective film, in order to protect. Any item on customer's specification, will take some extra time to customize the item as per customer requirement.We provide 12-months free maintenance. Before returning the items, please confirm the return address and the logistics method with us. We do our best to serve our customers the best that we can.