Joyin&reg; 10 Ft Set of 10 Mercury Glass ST40 Edison Style Holiday UL Listed Commercial Quality String Lights for Indoor / Outdoor Use - End-to-end Unique light set has a crackled finish creating the look of mercury glass(Green wire) Color: clear bulbs / green wire, Note allows a max of 3 strands connected together. Number of bulbs on string: 10 Bulb size: E17 brass base - fits into a standard C9 light socket Bulb shape: ST40 Spacing between each bulb: 12" Lighted length: 9' Total length: 10' ,6" lead cord ,6" tail cord