I bought some pre-made and it's something like 24/36. I find it hard to balance heat time, as I like quick heat, large vapor and still big flavor. But I am still playing and learning. And I guess that is the trick most everyone is looking to balance.Played with Clapton's quite extensively myself and found that 32g wrapped over 28 2mm coils to 0.4 is the sweet spot for me. Anything bigger and they take too long to heat.