Mason Bottle Plastic Mason Jar Rings (3-Pack) - Fits Any Regular Mouth Mason Bottle - Reusable, Non Toxic, BPA Free, Rust Proof Baby Bottle Jar Rings - Made in USA (Lid Covers & Jars NOT Included)

No covers with them

Much easier to deal with than worrying about the metal rings rusting. Also much easier to remove, whereas I found the metal rings sometimes difficult to remove. Not sure if it’s the rings or the silicone lids, but something in the system is not leak proof. Doesn’t bother me; I’m just more careful when I go to heat the bottle.

I love this brand and will continue to buy them. Perfect fit definitely functional and easy to use.

I wanted to love these, as metal rings can rust. I hand washed them and never put them in the dishwasher. They slowly started to break along this very thin rim around the top into these tiny little shards. Once it starts, it just continues. I was so thankful our 1 yr old never put them in her mouth. If the these were made thicker or removed that thin ring in their design, I would happily use them and recommend them. But as of right now, these are kind of a hazard.

The do leak like other reviews state. You have to line them up with the mason jar exactly right and tighten it just the right amount (but not over tighten because then it will pop off). Still an improvement over using the metal rings with sippy cup nipples though, so 3 stars for that.