Heavy duty 48ft (14.6m) black rubber cord. The string light is CE approved so it’s ideal for outdoor accent lighting décor. Use a set individually or connect up to 20 sets together end to end. The 48-foot cord has the ability to connect multiple sets which allows you greater flexibility so you can customize the layout to group in a canopy style, zigzag, straight line, scallop or whatever you imagine based on the ambiance you want to create.