3.5mm thick Kila Chef 11" Tri-Ply Copper Bottom Frying Pan (0.5mm copper) 11" Tri-Ply Copper Bottom Fry Pan for Gourmet cooking Sloped side, stainless steel interior cleans easily Extra thick 3.5 mm with 0.5mm copper for everyday use Ergonomic handle with stainless steel rivets Copper bottom, aluminium core, and stainless steel interior extend around sides