On an Aster RT mod with wood dosing capsule stem. The dosing capsules arrive next week but you can use a regular stem. The cap is optional. Basic package is two glass shorty stems and one dosing cap. The body and deck are 22 mm diameter. with the glass stem Here is a bocote stem. The internals are the same as the Imp I just turned down the diameter and made it shorter. The coils are closer to stem. This works great but the vapor is hotter than the Imp, imo. @paytonpenn and @antispleen have been testing so they should have some info for us.