Are they shatterproof
295484
Since I've never dropped nor broken one, I cannot say for sure. Your best bet would be to contact the manufacturer.
2243360
They do not have an indentation for breaking them. I don't think they would break cleanly.
2259459
They seem to be. These are really good quality, and do not break easily, nice selection of colors as well.
861493
Being glass, I can't say they are shatter "proof" but they are pretty heavy so I'm sure they could take a little beating.
1436916
Yes. They were packaged well and there was no breakage at all for those I ordered and received.
2040613
Yes, they won't shatter and they're glass not plastic so no weird chemicals. I wouldn't recommend handling them too much while they're full of hot liquid or using them to serve hot liquid as they're not insulated at all and the sides get very hot. Typically I just fill mine with hot water and tea and the stick them directly in the fridge to make iced tea.
175996
Shatter proof glass is a fiction. But these are very durable. Owned 2 years, daily use, broken 1 out of 6. 4 1/2 stars
2242218
Yes...they will wrk. And it will break less than a wk. I wouldn't recommend u buying this product
1909571
No. Be gentle with it because they are fragile as well. They work really well though
243151
No, I'm using these for every day. They have been quite durable for me. No breakage.
1836113
I wouldn't say it is u breakable but I don't think it's able to be shattered
2090296
These are not shatter proof. Very cute, solid manufacturing, but not for playing near or high traffic areas.
1183076
Mine have not cracked or broken. If you intentionally tried to break them you could probably do it. I've bent them and they have never cracked.
1017973
I don't know if they are tempered but I have dropped them once or twice each and they did not break. Obviously they withstand high temperatures. Both are still serving me well.
2209269
They are resistant enough to not break if dropped, and to deflect a small stone that might get kicked up while riding. This is as far as I have tested them.
2026573
They are hard but not in a way that you can snap them. They will bend but will not break. I made a mistake when I got these particular ones.
1532859
They seem like they would be. I guess it depends upon the speed of the metal pieces. While I have not done any type of ballistics test on them, the plastic is strong. Mine have weathered multiple lawn mowings and being found and played with by young children (2 and 5). They still work as well as the day I got them.