This bulb is purchased in bulk from Sylvania and repackaged into plain white boxes to save the customer money. The H4HD(Heavy Duty) bulb is manufactured by Sylvania Osram in Germany and is intended for motorcycle applications such as Harley Davidsons because of the vibrations and road shock associated with motorcycles. It is a 12v 60/55W. It is manufactured with a thicker filament and hardened glass instead the cheaper quartz glass like other manufacturers use. Replaces Harley Davidson part # 67697-81T.