I'll admit to being not overly thrilled with making a volcano but once I got started it was actually a lot of fun! 10", 9", *8, 7", 6" (mostly carved out to make a hole for the styrofoam cup). Found at literally 20 minutes before leaving to put dry ice in styrofoam NOT tin foil so I didn't have a chance to airbrush the cup black. The kids LOVED it as did the owner of the venue. 100% inspired by CCers Melchas and mamakinloch's volcano cakes. MMF, candy rocks, piping gel waterfall.