Titanium is the most preferred material when break resistance is concerned. It heats up quickly and keeps the heat for a long time.
The pan is heated with a butane burner, until the metal is red hot. Let the nail cool down a little bit until the glowing disappears and then add your oil/concentrate to the pan. A suitabel carb cap dabber can be held above the nail to collect the smoke before inhaling. The nail is unscrewable for easy cleaning.
Attention: The oil bowl/oil nail must be heated at the pan only, otherwise the standard grinding can break in cause of the expansion of the material.
More information about smoking oil or essence you will find at this infopage.