Flip Flip String Lights. Flip Flop Colored String Lights 8.5' Long Strand - These colorful string lights have 10 plastic colored flip flops.  8.5 foot long strand.  Each light is about 3" long.  Can connect up to 3 sets end to end.  Indoor or outdoor use. Note the color changes depending on if the lights are on or off and how it is viewed.