QYR18 Royal Wood Grain Single Double Curtain rod set is made of Aluminum Alloy material and has 28mm big diameter, 1.5 mm thickness. There are 3 colors for you choose. The surface is produced by Electrophoresis. QYR18 curtain rod is capable to support 35kg curtains and could be used for more than 10 years. This curtain rod set can make your room more beautiful, you will like it.