Set of 150 Heavy-Duty Christmas Lights. Item #W4W1503. Features Color red bulbs / white wire. Number of bulbs on string 150. Bulb size mini. Spacing between each bulb 4 inches. Lighted string length 50 feet. Total string length 51 feet. Additional Product Features These lights are made to commercial specifications. If one light goes out the rest will stay lit. Lights are equipped with Lamp Lock feature, which makes them replaceable, interchangeable and keeps them from falling out. Replaceable bulb, fuses, and blinker bulbs included. End-to-end connectors allow you to connect up to 6 sets of these lights together. UL listed for indoor/outdoor use. 120 volts, 60Hz, 0.51 amps, 61.2 watts. Wire gauge 20. Material s glass bulbs/wire.