This listing is for 10 *SUPER BRIGHT* Blue 12V Instrument Panel LED's. These LED's focus a narrow beam of light. Will light your instrument panel gauges over twice as bright as OEM bulbs.These are replacements for the 17, 18, 27, 37, 58, 70, 73, 74, 79, 85, 86, 206, 207, 286, 306, 307, 308, 406, 407 & 2721 T5 wedge base incandescent bulbs. LED's look good installed behind your gauges for better illumination. Colored LED's also look good behind the corresponding indicator lenses on your instrument panel and produce a much more vivid color. (Ex: Amber behind seat belt/check engine lenses, red behind oil/generator lenses and green behind turn signal lenses.) We also have Green, Yellow, Red and White LED's. See our eCRATER Store for those listings.Wedge type LED's are polarized, if they don't light simply turn them around to reverse polarity (+ -). These may not fit all the vehicles in the compatibility list. Please check your original bulb size before purchasing.Some models use the larger 194 wedge base and some models use this smaller mini 17, 37 & 70 wedge base.This listing is for the mini wedge. We have the larger wedge style available in our eCRATER store. Please make sure this is your size bulb before purchasing.These LED measurements are shown in the pictures above.These LED's are dimmable. Depending on how low your dimmer switch voltage will go depends on the brightness level of the LED. NOTE: We do not split colors. This listing is for one color only, but we offer ASSORTED color packs of LED bulbs which are available in our eCRATER Store. (example: 2 red, 2 green, 2 white, 2 blue and 2 yellow) We Ship WORLDWIDE!!!