OCGS 7500K H7 55W XENON HALOGEN LIGHT BULBS FOR HEADLIGHT BULBS The All-New OCGS 7500K PLASMA Xenon Quartz Glass Bulbs MADE IN KOREA ~ the All New OCGS 7500K H7 55W Xenon Light Bulbs FOR KIA HYUDAI HEAD LIGHT ~ GS PREMIER bulbs are made of fused quartz glass. They have excellent heat shock-resistance also prevent any damage to the lens and wiring harness have a longer life because they contain Xenon and Krypton gases