Here is a dandy of a pan. This skillet features the Large Block style logo and is what they consider a smooth bottom meaning it is absent a heat ring. Smooth bottoms are typically preferred for use on glass tops YES you CAN use a cast iron skillet on a glass top stove, just don’t bang it around or slide it back and forth aggressively. I have been using one on mine for 9 years with NO issues. This skillet has been cleaned via electrolysis and seasoned one time with my own blend of natural beeswax, crisco and olive oil. I have also lightly wiped it down with food grade mineral oil to prevent rusting since the humidity is picking up here in central PA.