Here are a few Different types of mandrels that I use to flame Dready's. They range from 7mm to 20mm.

A few of them are mandrels and a few are blow pipes for vessels but you can use them for bead. Umm don't you love the no rules to your stuff! Play how ever you like. You can tell by the use heat marks that I like the 10mm mandrels the best. If you use blow pipes just plug the top when you dip in your release to keep the core empty. Be sure to put on a nice layer for your base bead and use the melt down method to start get really nice edges to your Dready.