The centrifuge tube is made of high-purity PP material, EO sterilized, free of pyrogens, DNAs, and RNases, autoclavable at 121°C, and suitable for use in freezers down to -80°C. The transparent exterior allows for easy sample visibility. The 50ml centrifuge tubes are sterile and feature easy-to-read black graduations from 5.0ml to 50ml in 2.5ml increments. A large white writing area enables convenient labeling and identification. Graduations and writing area are chlorine resistant. The design includes a longer screw cap with a sealing ring to prevent leakage. The lid securely screws onto the tube, ensuring excellent sealing performance and minimizing the risk of liquid leakage. Smooth and flat inner surface prevents residue accumulation. These centrifuge tubes are suitable for applications in biochemistry, molecular biology, pharmaceutical and chemical laboratories, clinical diagnostics, and food science. Color: As shown. Material: PP. Package Contents: 1 set of 25 centrifuge tubes with lids. Note: Lighting and display settings may cause slight variations in color between the image and the actual item. Measurement tolerances may vary by ±1-3cm.