380ml Coffee Cup Sherlock Holme Season 3 Pattern Double Insulation Travel Mug Food grade PP cup Lid, food grade PP cup body Size: 7.3*6.2*18.2cm / Capacity: 380ml Double Insulation, non-toxic Pattern: Sherlock Holme When put the boiled water into a cup, because of the physical phenomena, the inside surface of the cup will produce white fog, but about five minutes later it will disappear automatically, this is normal phenomenon, please be at ease to use.