The OSRAM ULTRA LIFE are the most durable halogen car bulb in existence, promising a 3-year guarantee, the first of any automotive bulb to do so. These bulbs are perfect for drivers who are often on the road at night or for those who don't want to run the risk of a bulb blowing at an inconvenient time. They will last up to 3 times longer than a standard halogen bulb and are the most reliable bulb on the market. Suitable for use in any vehicle, these bulbs are E-marked to a high standard, making them 100% road legal. This pack contains two bulbs, each with a voltage of 12v and wattage of 21/5w, featuring a BAY15D base and twin filaments for brake and tail light functions.