Le Parfait Familia Wiss jars are a mason style jar.
The jars are heavy duty tempered glass suitable for pressure canners and water baths.
Like Ball mason jars, Familia Wiss jars have a 2 piece lid assembly.
The flat lid incorporating the seal is called the sealing cap. Note that these are shipped on the jar in an inverted position to prevent any prior impact on the seal prior to us..