Diffuse 4 pin 10mm RGB LED - common anode

These LEDs contain three separate LED chips, red, green and blue. By driving the three chips separately, you can produce any colour that you wish, including white light.
They are packaged in the standard 10mm milky white diffuse LED package but have 4 leads, not 2, with a 1.25mm pin spacing (there is one common anode lead and three separate cathode leads - one for each colour).

These are full brightness superbright LEDs with a fairly wide viewing angle. Continuous current per LED chip is 20mA (60mA for total package).