JDM ASTAR Extremely Bright 120-EX Chipsets White/Yellow 3157 3155 3457 4157 Switchback LED Bulbs with Projector For Turn Signal Lights(Only work for standard socket, not for ck socket) Package contain one pair EX chipsets switchback led bulbs.Buy with confidence! We offer "ONE YEAR" warranty on item(s) damaged during delivery or have a confirmed manufacturer defect. Light up Xenon white for parking lights or daytime running lights. Light up Yellow for turn signal lights. The turn signal flashes "amber-off-amber-off," instead of "amber-white-amber-white," which makes it easier to see.( most switchback bulb on the market flash amber-white-amber-white ) Fits: 3157 3157A 3057 3155 3157NA 3357 3457 3457A 4057 4114 4157 etc.Dimension (inches): 0.71 in diameter, 2.28 in length The bulbs equipped with constant-current driving IC and Aluminum Circuit Board ,heat-resistant, The 50w 6ohm load resistor or flasher relay might be needed to prevent the hyper flash or the bulb does not blink.