Festoon bulb , 6v LED non-polarity (can be positive or negative earth), each, suits indicators, brake light, tail light, interior car light eg BMW. Approximately 8mm diameter caps x 42mm long x 10mm diameter. 16 x LEDS with 4 on each side so the light is distributed like the old incandescent versions. These are VERY bright and only use 168 milliAmps. Rated at 70-80 lumens.