Professional grade carbon tail comb.
For damage-free backcombing that's also easy to brush out: ?take a small section of hair and hold it away from the head. Place the comb in the section a few centimetres away from the root. Push the comb down the hair, against the direction of growth, in two short strokes, stopping short of the roots. For the third stroke, push back right to the roots. Continue with this three-stroke method on every section you need to backcomb.