JDM ASTAR Extremely Bright 3030 Chipsets White/Yellow 1157 2057 2357 7528 Switchback LED Bulbs with Projector For Turn Signal Lights(Brightest Switchback bulb on the market) Package contain one pair 3030 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 ) Fit 1157 1157A BA15s S25 2057 2357A 7528 P21/5W double-filament bulb.Dimension (inches): 0.72 in diameter, 2.25 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 might be needed to prevent the hyper flash or the bulb does not blink.