These are standard-style, replacement halogen headlight bulbs – #9005xs size, 100 watt. The straight plug differentiates these from the 9005, which have a 90-degree bend. The icy blue tint on the glass cuts out the yellow tint normally seen on most halogen headlights. It does not result in a truly blue tint, as seen on some European-style headlights. Sold in PAIRS.