JDM ASTAR Extremely Bright 3030 Chipsets White/Yellow 3157 3155 3457 4157 Switchback LED Bulbs with Projector For Turn Signal Lights(Brightest Switchback bulb on the market) (Set of 2 bulbs) Buy with confidence! We offer "ONE YEAR" warranty on item(s) damaged during delivery or have a confirmed manufacturer defect. Compatible for both standard and ck socket .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): 0.85 in diameter, 2.51 in length The bulbs equipped with constant-current driving IC and Aluminum Circuit Board. Fast thermal diffusion ,heat-resistant, no digital and VHF radio signal interference. The 50w 6ohm load resistor or flasher relay needed to prevent the hyper flash or the bulb does not blink.