AMPERSAND SHOPS 10-Ft. 8-Rib Outdoor Patio Umbrella Solar-Powered LED String Lights (Cool White) Dimension of each rib: 1/2" W x 7/10" H (12 mm x18 mm) Shape of umbrella ribs: Elliptical (NOT square) Solar-powered; no electricity required! LED light quantity: 48 Comes with an "on/off" switch Includes 50 all-weather plastic clips to hold solar string lights onto umbrellas fabric cover