H4 bulbs have 3 pins on the base of the bulb. These bulbs have dual functionality so they are used mainly for headlight bulbs. This means they have both dipped beam and high beam in the same bulbs. Below is our full range of H4 products, including LED, HID and halogen versions. If you are unsure if these are the correct bulbs for your car then please use our bulb finder or get in touch where we will be happy to help.