RTIC Stainless Steel Lowball with Lid 12oz Set of 2 Double Wall Vacuum Insulation. Maximum temperature retention & insulates hands from the cold 18/8 Stainless Steel. Strong stainless steel construction Keeps Ice Longer. Holds ice for up to 24 hours 2 ounce RTIC lowball, set of 2 Do NOT place in dishwasher. Hand wash only