Formosa Covers 9ft Umbrella Replacement Canopy 8 Ribs in Charcoal Grey (Canopy Only) 9ft umbrella replacement canopy for 8 ribs umbrella in Charcoal Grey Fits 8 ribs umbrella frame. EACH rib must measure 52" to 54" 300 denier polyester fabric with UV treated and water repellent. Replacement Umbrella CANOPY ONLY. For 9ft 8 Ribs umbrella frames, Air vented and Tie Rope