2x D1s D1r HID Xenon Bulb Replacement for Audi A3 A4 Low Beam 8000k 100% waterproof and 100% dustproof. Resistance to heat and aging, as well as vibration tested. OEM quality and 100% Customer Satisfaction Guarantee Light lasts up to 3 times longer than conventional halogen technology Compatible with existing D1S headlamp optics HID lamps produce 70% more light than traditional Halogen lamps and use less power while producing less heat