The ceramic donut coil that Yocan provide are all ceramic, no
glues. It is also an optional replacement coil to give you more choices.It provides with Nice Flavorful
Hits and smooth clouds, dry hit preventing. Oil lasts longer during use,
concentrate saving. The air inlets were placed on the sides of the ceramic cup.
Looks nicer and avoids wax leaking from the bottom of the coil
with 5pieces of Coil