Includes two sets of 25 UL listed, 2.5 volt replacement bulbs. Designed for use with 50, 100 and 150 bulb light strings that sit on trees, garlands, wreaths and similar lighted decorations. Change the bulbs with ease using these convenient mini lights. Using high quality, LED light bulbs, these replacement lights are sure to bring holiday cheer for years to come. Each light bulb is 1 inch tall with a 3mm base. Indoor Use Only Reliable and long-lasting, these replacement bulbs have been UL listed and are designed for use with various light strings and decorations. Plus, with a compact size of 1 inch and a 3mm base, they are easy to change and perfect for indoor use. Enjoy the festive ambiance for many holiday seasons to come!