These battery operated Christmas lights are some of the smallest we've come across. Our Ultra Thin battery light sets run on 3 "AA" batteries and feature 18 LED bulbs with a 4" bulb spacing. These strings are approximately 6' long and are perfect for small craft projects, table center pieces, weddings, and costumes because of their small size. We've seen these Ultra thin, sometimes called Fairy Lights, strings used in wine bottles, vases, bouquets because of their small size and bendable wire. The wire on these strings is bendable and unlike most Christmas light strings, these battery sets wire is rigid and features a protective coating to keep them insulated but this solid core design allows you to twist and bend the bulbs anywhere you'd like.