Flashlight Grip Tape

[ikanode]

Also bicycle handlebar tape.

 

[Unicorn]

The thin grip tape for bats or racquets. There are multiple types in different thickness, texture, and feel. For a light I like the thinner ones that don't add much bulk to the light.

The tape used for things like hocky sticks also works, but is more like gaffers tape than a grip tape.