Great Product Quality: Anti-rust powder coated Fe-Al frame with 8 Aluminum ribs for durability. 8 sturdy ribs provide stronger support than 6. Single wind vent on top for stability. If you have any questions, please feel free to contact us. Comfortable Space To Enjoy: 2.7M diameter. Provide enough shade for a square,rectangle or round table with 4 to 6 chairs. Ideal for both residential and commercial space. Perfect for summertime family gatherings, afternoon tea with friends and etc.. Reasonable : Strong pole to match your patio table. Convenient with crank to open or close. Handy push button to tilt according to the angle of sunray to produce a large range of shade. Material: Umbrella Replacement is made of polyester, which is Waterproof, Long lasting, Fade- resistant, Easy to clean.