The product includes only 20 LEDs (10 red, 10 green). Please be careful not to reverse the positive and negative terminals. Cut the LED legs at your own risk. The original blue LEDs inserted in the main unit can be easily pulled out with pliers and replaced. The photos show actual replacement examples. I think it can also be used with the m109s. Quantities are limited, so please order early if you want to customize. I am also selling decal sheets for MXR m108s repair as a separate product (also used in the photos).