Custom made light strings made to work with the 9 volt battery kit. 18 solid colored 0603 Nano size LED's spaced at 3/4 of an inch. Wired with green colored mag wire. Total string is 12 inches and perfect for the small 1/2 or 1/4 scale Christmas tree. This string has all cool white colored LED's Please give us two or more weeks to custom make your strings as I do not normally have them in stock.