1. Made of borosilicate glass, featuring reliable thermal stability for daily laboratory heating and cooling operations. 2. Precise volumetric calibration design, delivering accurate volume measurement for professional liquid preparation and solution configuration. 3. Practical shake flask structure, suitable for uniform liquid mixing, shaking and daily laboratory sample preparation work. 4. Classic overall structure with smooth finish, easy to cooperate with regular inlaboratory supplies for smooth experimental . 5. Suitable for daily laboratory testing, scientific research, teaching experiments and various sample processing scenarios.