yup, i've seen the headshop lady toss them around...its called pyrex as previously mentioned, and it does break...seen it happen...but still stronger than glass, and the ones i've seen have been cheap and have a lot of color-changing patterns
ghettoBlunt Reviewed by ghettoBlunt on . Unbreakable glass My bowl is supposedly made of "unbreakable glass". The owner of the shop I bought it from threw it across the room before I bought it to prove it to me. It doesn't crack or anything if you drop it on a hard floor but I would like to know how far the strength of the glass goes. Has anyone ever broken an "unbreakable" glass piece? I'd like to know the threshold for this type of glass. Rating: 5