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【Material】- The cork stand made of high-quality, environment-friendly and high-density synthetic cork. 【Flask Cork Stand】- 80mm/3.1in laboratory flask cork stand, suitable for all kinds of round bottom glassware, convenient and practical. 【High Quality】- The flask holder is pressed by high temperature and pressure, and the thickness is 30mm. 【Feature】- Acid and alkali resistance, corrosion resistance, heat resistance, heat insulation. 【Performance】- Good elasticity,strong friction coefficient,make sure the flask can place stably.