Set of 4 - Le Parfait French Wide Mouth Glass Canning Jars - 12 Oz Each Le Parfait jars are French jars which have been designed specifically for canning and making preserves. Set of four 12 oz. /350 gram jars with 85mm gaskets. Le Parfait jars are useful for keeping nuts, grains, and other foods in an air tight environment. They are heavy, made from thick glass which can handle the heat of the canning process. Wide mouth jars come with rubber gaskets.