Well the pen pipe, you get one of those pens with the metal tip that you can unscrew off and take out the ink tube.NOTE* the metal tip will be used for the bowl do not loose it.Well take out all the uneccasary shit out of the tube part of the pen so its practically a straw (where you can blow through it and breathe in it).Well get the metal tip and and flip it upside down so the tip part is going inside the pen like a little bowl.So by now it should look like this >=========. > is the bowl and the ==== is the tube.Then get some tape and tape the metal tip/bowl onto the pen.Then you got yourself a little pipe.I hope I explained good.Heres a visual

<====== - shitty diagram of a pen you write with
turn tip around into tube >========= and tape it up.Not really rocket science.Personally love them.Hope you enjoy them just as much.There real cheap as long as you can afford a pen with a metal tip.