Source: Weck, Germany
Contains glass jar base, glass lid, natural rubber seal, and two stainless steel clips. Each individual part can be replaced and sold at individual pricing. The design of these jars also allows for food to avoid contact with plastic-lined and rust-prone metal canning lids.
Microwave and Freezer Safe (if you leave one to two inches of headpace)
The rubber rings can (and should!) be reused, but the FDA recommends using a new ring each time you can with a Weck Jar.
Natural rubber rings will stretch out if in contact with an oil-based substance. Weck recommends wiping the rim of the jar before sealing to prevent stretching.