They are pretty good. Reasonably reusable for a standard pipe if you don't mind getting your fingers dirty. Can burn down the last bit of tobacco a bit easier. Worth a buy.
Typically I smoke 2 bowls a day. Very occasionally 3How many times can you reuse the Nording Keystones?
I've used akadama soil.Im cheap. I break up broken red clay pots that got broken during use. Give them a rinse in the colander and you have a big batch. The textured clay is very absorbent. The other benefit is it keeps your pipe considerably cleaner.
