Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not Freezer Safe and a Health Hazard

Having used this glassware for several weeks without any issues, I used them to store items in the freezer. About a week later I started taking the frozen containers out of the freezer and they would shatter randomly. Sometimes I would try and take the lid off and the container would shatter, other times it would shatter when I placed it on a dry countertop. I cannot recommend these items at all because of the danger they pose with all of the glass shards being around food and in the kitchen. They were great products until they started breaking during normal use.