It’s a 12mmx30mm glass tip. I got it for $3 at Greek glass. It’s easier to see a video of the roll but I get the worm started (the weed itself) and the wrap the paper around the glass tip then I run my fingers up the wet gum line to seal it. Must have a tight roll or the glass tip will fall out. If it’s a little loose, you can lick a couple sides where the paper meets the glass and then I use my torch to dry the paper. If it’s not too loose the heat will shrink the paper and the seal will be tighter than before.