lol the glass is unbreakable =) we can only buy super thick glass, I can throw it in the driveway and it wont chip HAHAHAHA
its all the same stuff those unbreakable glass pipes are made out of. funny, i only heard about the glass when i discussed pipes with a glassblower years ago LOL I am sure if I hit it 900 times with a sledgehammer it would break but as far as the kids go, were good LOL