HAOYUNTE spring tension rod is very sturdy and durable, the material is Iron Alloy+Rubber, The top rubber material can be effectively non-slip, suitable for rough brick walls, wooden frames, or smooth ceramic tile walls White spring tension curtain rods 18 to 28 inches (7/8" diameter outer rod with 3/4"diameter spring inner rod), Installation Instructions. Just extend and adjust the length according to the size of your window. Our package includes installation instructions, just follow the steps according to the step-by-step installation diagram, and you can easily complete the mounting of these curtain rods by yourself in 5 minutes. This modern curtain rod.Looks simple and elegant.Ideal for a variety of scenarios, both indoor curtain rods for living rooms, bedrooms, dining rooms, and kitchens and outdoor curtain rods for patio.