The 1157LL long life replacement bulb is a quality auxiliary replacement bulb that will last up to 2 times longer than regular bulbs for continuous use. The bulbs have a sustainable design for reduced environmental impact - no mercury or other hazardous substances used in the making of these bulbs. The nickel-plated brass base contacts for superior connection over time. Ideal for parking, back-up, side marker and turn signal light bulb replacement.