Including 15 Bulbs(1 Spare): Each strand contains 15 E26 based hanging sockets, provided with 18pcs 11W S14 incandescent bulbs . The distance between bulbs is approximately 3.11FT. This Heavy-duty light is bright enough and ideal illumination anywhere. Weatherproof & Heavy-duty: This outdoor string lights are UL listed weatherproof commercial. The insulation material can protect the strand from hot winter, sun, wind, rain, snow and damp. Flexible heavy-duty cord withstands the wear of indoor and outdoor use. Dimmer Compatible to Set The Right Mood: For greater mood lighting flexibility and a soft glow, a dimmer switch【not included】 to create the perfect atmosphere for a birthday party, family reunion, or wedding reception. It adds flair to bistro deck porch patio garden backyard terrace pergola café restaurant malls for wedding BBQ party banquets, also suitable for tree-lighting like Christmas tree. Smart Installation: Each socket has hanging hook above, makes it easy for hanging with hooks, guide wires, or zip ties. It can connect with another simply use grounded cord plugs into any standard outlets. Link up to 5 strands. Satisfaction Guaranteed: Your satisfaction is first. If you are not fully satisfied for any reason, please contact us.