Inner liner: Typically made of stainless steel, it boasts excellent insulation and corrosion resistance. Some high-end vacuum cups feature inner liners with processes like silver plating to further minimize heat radiation.
Shell: Multi-purpose plastic, stainless steel or glass and other materials, to provide durability and comfortable feel for the vacuum cup.
Sealing ring: Generally, high temperature and aging resistant materials such as silicone are used to ensure the sealing between the lid and the body of the cup, preventing liquid leakage and heat loss.
Cup lid: There are various types of cup lids, such as spiral type and press type. Some cup lids also have functional designs such as tea strainer and hidden compartment.