1、Borosilicate Glass: This bottle is made of borosilicate glass, suitable for boiled water and ice water, and can withstand the rapid temperature difference of ‑ 20 ℃ to +100 ℃. It does not crack when cold and hot alternate, and does not contain bisphenol A. 2、Features: This double layer water bottle is beautiful in appearance, durable, lead free, without odor, stain free, clean and safe to use. 3、Stainless Steel Filter: This tea cup has stainless steel filter, fine distribution of tea mesh, fast tea separation, tea residue filtration and it is durable. 4、Silicone Sealing Ring: The glass bottle has strong sealing property and is leakproof. The built in silicone sealing ring can effectively prevent water leakage. 5、Double Layer: The cup has a two layer design, which is heat insulated and scald resistant, and has a glossy surface. It is an ideal choice for storing water, beverages, and tea making. Item Type: Tea Water Separation Cup Material: High borosilicate glass and 304 stainless steel Gross Weight: 300g/10.6oz Size: 18X7cm/7.1X2.8in Product Specification: 280ml 1 x Tea Water Separation Cup