When installed in your clear lenses the bulbs are nearly invisible but when illuminated provide a street legal, orange color that is sure to get noticed. Commonly used in European vehicles such as Audi, Mercedes-Benz, BMW, Volkswagen and Saab. Looks like an 1156 bulb but with offset pins. Please see picture. Similar to an 1156 bulb but with an offset pin BAU15S base. PY21 21W Mirror Orange.