Pentrix is just a cheap and simple sport that anyone can afford. All you need is an object that looks like a stick (preferably a pen), functioning hand, wrist and fingers and your focusing power.

So, this website also provides information about the various kinds of pens you can use based on my opinion. Whereas the other things you need for pentrix is up to you.

To make twirling easier, the weight of the thing that is spun must be well divided. So for tricks like the 360, I use retractable pens with grib and smooth surfaces and sometimes, a new pencil which hasn't been sharpened yet. These kinds of pens are recommended for beginners.
The traditional capped pens that have a gauzy plastic surface and two ends which are very different in weight are hard manoeuver. The capped ends of these pens are usually the heavier ends. They tend to slip off after beign spun a few times. These pens can possibly be spun when you uncap them and cap it on the other end.
Pentrix, like what the name says, involve doing tricks with pens. But what if you're in the middle of a place without any stationery and feel like doing the Charger pretty badly? Try looking for something like these...