[High-Purity Material for Durability]:These tubes are designed with longer screw caps featuring sealing rings,providing a leak-proof closure and preventing sample leakage.The smooth,flat inner minimizes residue,making them ideal for a variety of laboratory applications. [Clear Marking and Easy Identification]:Each tube comes with a convenient white writing patch that resists matting,allowing for clear and easy sample marking and identification.The large,unerasable frosting white printed area ensures that your labels stay legible,even under harsh laboratory conditions. [Accurate and Easy-To-Read Graduations]:The tubes feature precise black graduations that are accurate to 2 percent ,with 1mL increments up to 50mL,allowing for reliable measurement in your scientific experiments.The easy-to-read scale and large writing space make these tubes perfect for recording sample data directly on the tube. [ and Temperature Resistance]:These centrifuge tubes are ,non-pyrogenic,and DNase or RNase free,making them safe and ready for use in sensitive biological applications.They are autoclavable at 121C or 249.8F and freezable to -80C or -176F,withstanding high pressures and providing versatility for different laboratory procedures. [Wide Range of Laboratory Applications]:Ideal for use in biochemistry and molecular biology,these tubes are widely used for the separation and preparation of various biological samples.Their high-quality material and precise design make them suitable for high-speed centrifugation,sample collection,transportation,and more,catering to the diverse needs of scientific research and analysis. Colour:As shown Material:plastic Package Contents: 50 x Tubes Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.