5 Pack of steady burning mini Red transparent Christmas Tree Light Replacement Bulbs. The red steady burning transparent replacement bulbs are rated for USA 2.5 volts. The red light bulb mini replacements are pre-tested and guaranteed to light. The replacement bulbs fit a mini light bulb socket. For use with 50-100 light sets, and 140 lite super bright chasing sets. Instructions on how to replace the bulbs are included. Each replacement bulb is a long life bulb, cool burning, and the transparent replacement bulbs are USA-UL approved. Replacing Your Mini Light Bulbs 1. Make sure set is unplugged. 2. Pull Mini Light bulb and its base straight out of the socket. 3. If your bulb must be removed from it's base, straighten out the wires which are at the base and gently pull on the bulb. 4. Insert the new bulb by guiding each of its two wires into its own opening at the bottom of the base. Then, bend each wire upward over the base. 5. Push bulb and base back into the socket, matching grooves so that the bent wires touch the metal plates in the socket. use on 35- 50 lite strings.