The bulb is designed with halogen bulb technology and is a super bright type, providing a higher light output, compared to ordinary bulbs with higher light output.
The bulb adopts BAY9S type copper head, which has good conductivity and high temperature resistance. Copper material can effectively reduce the resistance and improve the efficiency of current passing.
After purchase, you will receive four H21W automotive halogen bulbs. This product is widely used as daytime running lights, turn signals, fog lights, reverse lights, you can replace them according to actual needs.