◇ This set includes four 3mm diameter LED bulbs: two in warm white for headlights and two in red for taillights. ◇ The voltage is safe up to 12V due to the included resistors, but they will become quite bright from around 5V. ◇ These are a good size for converting the incandescent bulbs used in headlights and taillights of older vehicles from manufacturers like Endo, Katsumi Model, and others to LEDs. ※ Please check the diameter of the mounting area and the size of the existing bulbs before replacing, as some models use 4mm diameter bulbs. ◇ Small diameter heat shrink tubing is also included for reinforcing connections and insulation. ・ Inner diameter: Ф2.0mm, Ф1.5mm, Ф1.0mm, length 10cm x 3 pieces each. ◇ As shown in the last image, you can use them to connect multiple wires of the same diameter or to connect thicker wires. Vehicle type...Optional parts Type...Lighting