Double glass， lids overall selection of designated countries made of food grade PP， mug selection of high quality borosilicate glass high-temperature combustion system， fine， smooth， drinking comfortable， healthy and safe， non-toxic， odorless， completely in line with national health standards. Thickened bottom of the cup， with a non-slip silicone ring more effectively protect bottom of the cup， not easy to break up， glass and desktop reduce friction， durable. Double-layer structure design， creating perfect quality， very crystal sense， has good insulation effect， the delay time can also be cold insulation. Lids have silicone ring seals， close the lid to the top with a foldable stainless steel portable， stylish accompanying. Inverted cup can be watertight， with its tea tea clearly visible， people preferred tea.