High-grade health care cup. Feijian mug is a domestic brand, which was founded in 1998. It is a second-line brand with good quality and high cost performance. Feijian is a high-purity metal gear, with good quality and technology, exquisite and guaranteed, so Feijian is a high-grade health care water cup. A thermos cup is simply a cup that can keep warm. It is a water container made of ceramic or stainless steel and vacuum layer.