These are high grade 10mm LEDs with both red (635nm) and green (565nm) chips, connected as common cathode. By varying the current through each chip, any colour between red and yellow-green, such as yellow, orange, red-orange etc can be produced.
Typical output is 20mcd @ 20mA for each colour at a 80 degree viewing angle. Diffuse 10mm case. Ideal for general indicators where more than one colour is needed.
They are part number SSL-LX100139IGW, datasheet is here.