I have 3 cast iron items all with porcelain interiors. My Dutch oven, a 3 qt. saucier and my newest addition a large covered skillet. The latter was a Christmas gift from my husband, all with the Cobalt blue exterior. So easy to care for and cook with. The manufacturer says do not use cooking spray instead use a little bit of oil. Hand-washing only for these beauties along with my stainless steel cookware.