Each bundle contain 2 bulbs, 2 ballast, and accessories
Xenon Bulb: 2 xenon bulb fits socket size and color described on the title
Ballast: 55W slim size electronic ballast for xenon bulb
Installation: pre-assembly maybe required before installation, professional installation recommended
Compatibility: 9005 mainly used for high beam, please check existing bulb before placing order, if not sure please visit sylvania bulb reference guide, using Amazon partfinder or garage will not guarantee fitment, 12V input required