Sigma Metallica Hot Pots Are Solidly Insulated With Best Quality Polyurethane Foam To Keep Inner Contents Hot For Longest Period.Inner Mirror Finish is Fabricated Out Of Non Magnetic Stainless Steel Material, Outer Body And Lid Components Are Moulded From Virgin Food Grade Plastic Material For Sturdy Performance And Beautiful Look.Do Not Use Any Harsh Cleaning Powder To Clean it Any Soft Detergent Powder Or Soapy Water And Damp It With Clean Cloth.