What are Cable Cherries? They are a simple 7mm diameter spherical aluminum cable crimp that utilizes a set screw to pinch your cable, instead of a crimping tool, pliers, a rock, etc. This makes it serviceable on the trail, re-usable, and much easier to grab the end of your cable for tension adjustments.
Especially handy for folks who want ease of adjustment and cable changes, and are running rim brakes or cable actuated discs. Better yet, buy them for your friend who is always running out of crimps and has cable ends that are, well, naked and a-frayed.
Cable cherries work on all known diameter of cable, and so will be fine on both brake and gear cable.