These are the optional lids for the working glasses.
The optional lids which can be used to make a watertight seal so you can store stuff in them, keep your drinks inside despite being inverted, etc. They are not a replacement for canning jars however.
The lids are not microwave safe. We do not recommend putting them through the microwave.
Luminarc is a brand of Arc International. Arc International has its origins in France since 1825, and is one of the leading providers of quality glassware worldwide.
