Professional quality: High-quality vacuum negative pressure test tubes suitable for use in clinics, laboratories, and other medical settings. Durable construction: Made from high-performance glass material, these vacuum blood collection tubes deliver reliable results. Enhanced visibility: The high transparency of the tubes allows for easy observation of the contents, and the included lids ensure a secure seal. User-friendly design: These test tubes are easy to use, disposable, and safe, providing great convenience in various applications. Versatile usage: Our test tubes cater to diverse experimental needs, making them ideal for venous blood collection.