Originally posted by Al100
It's PVC pipe. I used one of these and IMO it doesn't work any better than just using theraband or similar. Also, a lot easier to use.
FYI, there are probably few people who have worked harder on girth than me and I can tell you what works best for me is doing DLD's girth exercises (any of them, or preferably as many of them as you can), followed by a theraband wrap to maintain engorgement for 1/2 hour or more.
I also had very good results with pan squeezes (I could use almost my whole 200+ pound bodyweight) but they caused awful discoloration so I had to stop.
Good luck and I hope you gain easier than me.