VEE GEE 20270-Series Media Bottles are the perfect choice for samples. The blue caps are threaded and the pouring rings are both autoclavable. Bottles have large, permanent marking squares. Featuring the best quality of glass on the market, VEE GEE Media bottles are manufactured from high-quality borosilicate tubing. Bottles meet ASTM E-438 Type 1, borosilicate glass specifications. Available in Clear and Amber.