4-Piece: 5mm. Encapsulated bottom stainless steel pan set. Consists of 14cms. Milkpan, 16,18 and 20cms. Saucepans with lids. 10 year guarantee. 6-Piece: 5mm encapsulated base. Comprises: 14cms milk pan w/o lid, 16cms and 18cms saucepans with lid, 20cms -