The pressure cookers are nice and sturdy aluminum and work perfectly, but I was really hoping to use them for canning.  It will only fit pint and half pint Ball jars.  Based on the measurements I thought that pint and a half and quart Ball jars would fit but they do not.  Also they do not have an actual pressure gauge so the pressure reached will be approximate and is only measurable by the intensity of the rocker's movement.