Review on Nakpunar 12 Pcs 4 Oz Hexagon Glass Jars With Black Lids (4 Oz, Black) by Cassie Moore

I have been happy with these. The lids seem to form positive seals. I accidentally dropped an empty one from 3 ft high onto a bamboo floor (not as hard as concrete or stone, but still a fairly hard surface) and it did not shatter. I haven't exposed these to extreme temperatures or temperature swings, but I have put these on 250F hot plates (lid off so as not to allow the build up of internal air pressure upon heating) without issue. I've had them a year or two now I think and haven't broken any of them. None of mine were defective. The lids scratch fairly easily, so don't scrape at them with metal implements. Not a big deal to me.