Porper’s Tip Burnisher gives your pool cue tip a smooth, hard side to help prevent cue tip mushrooming. Wet the sides of the cue tip all around and then slide the Porper Tip Burnisher over tip and turn back and forth. The concaved shaper of the Porper tip burnisher will compress any mushrooming as well as harden the sides to help prevent further tip mushrooming. Fits up to 14mm tip.