It is meticulously crafted from high-quality borosilicate glass 3.3, renowned for its exceptional resistance to heat and a wide range of chemicals. Adhering to the stringent DIN 12252 standards, this stopper ensures both reliability and durability in laboratory environments. The innovative design features a lower closed end with a "drip-tip," facilitating the return of adhered liquids to the flask, thereby minimizing sample loss. Its hexagonal flat head not only prevents the stopper from rolling but also allows it to stand upright, reducing the risk of contamination on the ground surface.