Material:Made of high borosilicate heat-resistant glass which is very THIN and very LIGHT but durable. The thickness is about 3mm resistance to temperature change -30 ℃ -150 ℃, pure hand-blown, can be directly heated on the fire like gas stove, electric furnace and other direct heating. The difference between high borosilicate glass and ordinary glass: The biggest difference between borosilicate glass and ordinary glass is that it has a very low coefficient of thermal expansion, which is insensitive to temperature. Unlike the general object of the common thermal expansion and contraction, it has high temperature, cold and heat shock resistance, can withstand 200 degrees temperature difference. Commodity components: Glass Cup x 4Product Dimension: Dia. Top 2.5 inches x Dia. Bottom 1.4 inches x Height 2.2 inchesMisunderstanding of tea 1. Should not use insulation Cup 2. Time should not be too long, the best time for drinking is soaked for 4-6 minutes 3. The first pot of tea poured with hot water needs to be filtered.
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