Thick walled, wide mouth, and made of heat-tempered glass.
These jars can withstand the heat and pressure endured in water bath and pressure canning. If you are using a pressure canner, you will want to use a Mason jar or an equivalent canning-style jar. Ordinary jars will crack and break. Check out the different lid options found at the links on each order page. These lids will provide the seal you may be looking for.
Be sure to check out our other glass jar options if you are looking for other shapes and styles.