Review on Pack Plastic REGULAR Mouth Mason by Jack Harrell

These lids are a little flimsy and appear to be made to a minimum specification. The separate O-ring is also somewhat annoying. I don't think I will buy these caps anymore. I was expecting something with a more solid construction. However, they seem serviceable and I have used them without incident. Two covers were also supplied without O-rings. It was a disappointment. To me, this indicates poor quality control, which added to my impression of the poor quality of the entire product. But hey, that's a glass lid, not an artificial heart. They do their job.