Mitre 20 oz Vacuum Insulated Stainless Steel Mug is made of stainless steel 304 interior with stainless steel 201 plus AS exterior that has a matte finish with comfortable welded handle and a clear plastic press on lid with sliding drink opening. Keeps beverages hot for up to 6 hours and cold for up to 8 hours. Hand wash only. FDA certified. Complies with CPSIA, FDA, Prop 65. 6.375" H x 2.875" Diameter