3M Hanging Umbrella ,the frame is steel and aluminum ,the fabric will be Polyester,Low price and used widely. 1. 3M Hanging Umbrella.The Dia. will be 3M,the ribs will be 8 or 6pcs.2. The frame is made of steel or aluminum, and the fabric is Polyester.3. It's light ,easy to carry about. Hanging Umbrella HU301