These media bottles are mainly made of borosilicate glass with fire resistance, thermal stability, water resistance, alkali resistance, acid resistance and other properties, good strength, not easy to break, can be applied for a long time. The blue screw cap can reduce the risk of liquid evaporation and exposure, made of polypropylene material, which is resistant to corrosion and high temperature, and the lid can be sterilized by high-pressure steam treatment at 140°C. The scale is very clear, and it's practical for daily use with easy grip and self sealing lock. Also it is leakproof.