This can be anything from a tip shaper, to a shaft burnisher etc.......
Personally, my Porper tip shaper/pik is THE best cue maintenance item I have.
Pete, I think this is a good thread to open up and put some information out there that appears to be over looked.
The best cue maintenance items are also the cheapest:
1) Keep your hands clean when playing, and when you chalk your cue brush the chalk on do not drill the chalk. After chalking blow the excess chalk off your tip, and do not do this over the table.
2) When finished playing wipe your shaft, and cue off with a soft very slightly damp cloth to remove dirt and chalk residue, before putting your cue in your case. Once your case becomes contaminated with chalk residue, every time you push your cues into it or remove them you are sanding your cue and shaft because chalk residue is abrasive.
3) To burnish your shaft carry a piece of soft Card Board in your case. After you wipe it down as mentioned above use this card board to burnish the shaft. Carry another small piece of Card Board to burnish your tip, but do not use the same Card Board that you use on the shaft, because of the chalk residue.
4) There are many tip shapers out there but to get the maximum use out of your tip do not buy one that tears the tips surface, a fuzzy tip will take away from draw and types of ball control. The surface of the tip must remain relatively smooth, and this is why I think the tipik is a great item for loosening the tips surface without tearing it. To shape the tip, nothing works better than a piece of 100 grit sand paper taped to a small flat piece of wood.
Hope this helps