Zojirushi Set of 2 Stainless Mugs, KHE48 Black & KHE48 Smoky Blue, 16 oz One SM-KHE48BA and One SM-KHE48AG Stainess Steel Mug are included Stainless steel vacuum insulation keeps beverages hot or cold for hours Durable and sanitary 18/8 stainless steel interior with SlickSteel Finish SlickSteel Finish interior resists corrosion and repels stains Flip-Open lid with safetly lock prevents the lid from opening accidentally