FlexFilament C7 Shatterproof E12 String Light Kits. Get the beauty of vintage incandescent visible-filament lights, with all the modern energy savings and durability of LED, with these flexible filament string light sets. The curved filaments are lined with LED diodes that produce a warm, beautiful light. Yet you can operate them at a fraction of the cost of incandescent bulbs. Enjoy the beauty of LED flexible filament during the holidays and all year long. Hang these lights along the roof, across a porch or fence, or wrap them around trees for your most exciting holiday light display ever! Commercial string light sets include C7 bulbs and E12 light strings; to assemble, simply twist bulbs into light sockets. Energy efficient bulbs reduce power needs by up to 90%. Heavy duty SPT1 insulation. LED bulbs always remain cool to the touch. Max connect up to 960 watts only. Indoor / Outdoor use. 15 Lights, 15 Feet: 12W per set. 25 Lights, 25 Feet: 20W per set. 50 Lights, 50 Feet: 40W per set. 100 Lights, 100 Feet: 80W per set.