These are great; I find that one of the 40mm and one of the 33mm together has the perfect heat and longevity for a standard Mya bowl. Happy Smoking!
These are my favorite Quicklights on the market. Although I get better heat management with the 33mm than the 40mm.
These are grate, and very easy. Just watch your eyes, they spark and smoke up a bit at first. Fun to watch the first time! They only last about an hour though and because they are so large, unless you have a very large bowl they burn a good bit of your shisha faster.