Demeyere Apollo Duo Grill 15-inch flange rimmed rectangular disk is a griddle and a grill Shallow flange permits easy use of a spatula. Unique Silvinox surface treatment improves the resistance of stainless steel preventing discoloration, tarnishing and dulling due to handling, and contact with aggressive detergents and certain foods. Silvinox is also easy to clean. Features 7 ply material with a 5mm-a pure aluminum core for optimal heat distribution Matte polished Silvinox surface treatment