The pipe cleaner ring is the standard low-cost substitute for the Falcon moisture ring. You make them by cutting small segments off a pipe cleaner and wrapping it around a pipe nail or something similar to give you a ring, and putting it in the moisture reservoir ("hydrodome") at the base of the bowl. When I ordered a Falcon from Iwan Ries, but no moisture rings, someone at the shop cut and bent me some pipe cleaners for the purpose, which I thought was very classy of them. That's standard with Falcons and similar pipes and has been done for fifty years or more.