AMPERSAND 9-Ft. 8-Rib Offset Patio Umbrella Solar String Lights (Cool White) Designed for elliptic umbrella ribs only; will not work for umbrellas with square ribs Dimension of each rib: 1/2" W x 7/10" H (12 mm x 18 mm) Solar-powered; no electricity required; LED light quantity: 40 Comes with an "on/off" switch Includes 42 all-weather plastic clips to hold solar string lights onto umbrellas fabric cover