One Pair 3157 RED 31 LED Light(2 bulbs) /12V / Turn Signal Light, Corner Light, Stop Light, Parking Light, Side Marker Light, Tail Light, and Backup Lights 31 LEDs Per Bulb, Wide View Angle/ Piranha Type Double the Light Output! 19 LEDs up layer, 12 LEDs down layer. Total 31 LEDs Lights with Wide View Angle for better reflection Diameter 25mm (1.0"). 22mm height (LED part). 42mm total height. Cross Reference: 3057, 3357