EL(electroluminiscent) indicator is calling "cold neon" and powered by 220V AC 400 Hz (for best glow, but you can also use electricity 50-60 Hz) without additional resistors. This have a nice vintage looks and magic contrast neon light. 

Lot contains of 2 pcs of EL indicators.

Photo made with UV light. If connect it - it glows same. (Just couldn't found my power supply)

Dimension of every is 6 x 4 x 1.5 cm

You may use it for DIY projects like backlight, as segments of something like digits or letters, nixie or VFD clocks separators and anything by your fantasy. 

Look for another color and dimensions of these type of indicators in my store!