With the All-Clad Copper-Core porcelain double boiler insert, you can melt chocolate or gently reheat foods with confidence. This duo features a 2 quart sauce pan made of five layers of metal, including a core, copper layer to generate optimum heat distribution and conductivity. The 1.5 quart insert has a porcelain base to be placed over gently simmering water. You'll gain optimal temperature control of delicate ingredients without the threat of scorching or burning foods. This set comes with two lids to fit each piece individually.