Tiger mje-a mugs are carefully manufactured in japan with attention to details. They are light, secure, and a breeze to clean. The vacuum insulated double wall will keep your drinks hot or cold for hours. details: - 12oz. / 0.36 l capacity or 16oz. / 0.48 l capacity - vacuum-insulated stainless double wall - one push open and automatic lock - easily washable - easy to hold shape - cold and heat retention - made in japan