Insulation cup (Vacuum cup) is generally a water filling container made of ceramic or stainless steel plus vacuum layer, with a top, sealed, vacuum insulation layer can make the internal water and other liquids to delay heat dissipation, to achieve the purpose of heat preservation. Teencher Inspection team consists of professional quality control and international trade experts, each member with extensive inspection experience and very strong sense of service. our inspection can help you to reduce logistics costs, return risk, complaints, compensation and potential brand reputation due to quality problems.