ROORs are made out of durham schott(german for pyrex) glass. I have the ROOR bag that comes with it, and I have dropped it from about 5 ft. and it didn't break. Then again, the bag is very padded. However, I've knocked mine over onto a glass table about three times and it didn't chip the outside. I've noticed some chipping from pulling out the diffuser, but that's about it.

Still, take care of it. They are a very expensive investment, but to me, there isn't any better way to smoke.