Not trying to steal your thunder but I saw this a little while ago, there are 4-5 revisions, the most recent (and expensive) is the crown with a cut for an enail coil, dabbers, and carb cap along with color changing silicone.
The main reasons I haven't bought one is it's low temp rating (400) and the price. By the time my enail cools down to 400 I might as well just pull it out with a silicone oven mitt.