35W Replacement Pair of AC Slim Digital Ballasts 2504 They provide the AC current

They provide the AC current the bulbs can operate on by converting it from the direct current of your vehicle

Heat sinks are made of cold-pressed aluminum which reduces the operation temperature of the bulbs by 40%

HID D1R Replacement Bulbs

Due to this you can expect longer lifespan of the HID kit

35W Replacement Pair of AC Slim Digital Ballasts 2504 They provide the AC current35W Replacement Pair of Slim Digital ballasts for improved operation of HID system. GREAT CUSTOMER SERVICE & THE BEST QUALITY 2 YEAR WARRANTY These ballasts are composed of much smaller parts and still deliver the same output as standard size version. They are lighter and easier to fit them inside, which makes them compatible with nearly all the vehicles and all the lights types. Features: Extra slim You can mount them on a safer place in your car