Feature 1Select high-quality, environment-friendly and high-density synthetic cork 2The flask holder is pressed by high temperature and pressure, and the thickness is 30mm. 3Acid and alkali resistance, corrosion resistance, heat resistance, heat insulation 4Good elasticity,strong friction coefficient,make sure the flask can place stably 5Suitable for all kinds of round bottom glassware, convenient and practicalSpecification Features: Select high-quality, environment-friendly and high-density synthetic cork The flask holder is pressed by high temperature and pressure, and the thickness is 30mm. Acid and alkali resistance, corrosion resistance, heat resistance, heat insulation; Good elasticity,strong friction coefficient,make sure the flask can place stably Suitable for all kinds of round bottom glassware, convenient and practical Specification: Material: cork Outer diameter: 80mm/3.1in, 100mm/3.9in,110mm/4.3in,120mm/4.7in,140mm/5.5in,160mm/6.3in(Optional) Height:30 mm /1.2in Weight: Approx.30g~60g/1.1oz~2.1oz Package list: 1 x Laboratory Flask Cork Stand