Ummagawd TBS Tango Grip Tape - Easy to apply 

Having a confident grip on your radio means you can relax and focus on the flying. When things get tense, Tango tape will keep those sweaty hands firmly in place. Tango Tape has been designed to have just the right amount of grip in all the right places, without sanding off any skin. Although this has been specifically designed for the Tango 2, the “fish bone” pattern allows it to follow any curve, so it can work for most other radios as well. Be sure to keep any left over pieces to add, customize, or replace as you spend more time with your new grippy radio.