Replacement umbrella canopy for 9ft 8 ribs patio outdoor umbrella, Replacement Canopy only. Make sure your umbrella is 8 ribs/8 panels, each ribs length must measure 52" to 54". The diameter of the hole at the very top is about 1/2 inch. 500 Denier / 180g polyester fabric, 95% UV Protective. Equipped with air vent, Fit with wooden, Aluminum, Metal or Fiberglass Market Umbrella frames. Easy to install