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Product Name : Double-Wall Cup Volume :350ml Heat Resistance :Instantaneous 20-150 Degree Celsius Shape : Round Material : Borosilicate Glass Package : Foam carton Box Color : Transparent Structure : Double Layer Clear:Easy to clean Size : Caliber Wide- 3.93 inches ; Height- 4.33 inches About material (Borosilicate Glass) It is a kind if low expansion rate,high temperature resistance,high strength,high hardness,high transmittance and high chemical stability and special glass materials. Feature on this product: This product uses the heat-resistant high borosilicate thin glass material, causes the water cup to withstand the -20℃-150℃ temperature change, even if freezes the cup immediately to put the boiling water also not to appear the burst and so on the question, the pro can rest assured to use. The cup body is light and different from ordinary glass. After tea, the hot tea soup in the layer of transparent glass refraction under the very ornamental aesthetic feeling. Utensils. · There is a Small Hole in the Bottom of the Cup, Which is The Unique Trace of the Manual Blowing Process.Not a Flaw.