In this kit, you get 27pcs, The centrifuge tube holder set meet your laboratory tests demands, so you can use it with confidence. The centrifuge tube is made of high quality PP material, which is and treated for better heat resistance. Smooth inner wall and uniform thickness. Transparent design, easy to observe. Equipped with flat screw cap design, good sealing, can effectively prevent sample leakage and volatilization. The rack is made of high quality Material, sturdy and reusable, the use temperature range is -20 to 70 ℃ (not boil ). There are two colors: blue and orange, different size holes for .simple structure, easy to assemble. The detachable design allows you to carry it around and save space, giving you a good experience of using it. Equipped with clear scale graduations for easy reading. Accuracy is ±2% in 2.5mL increments for a total of 50mL, allowing you to measure accurately. The 50ml centrifuge tubes are widely used in laboratory clinical chemistry and scientific experiments. Suitable for storing samples, specimens, powders, pills, biological samples separation, sample handling and high speed centrifugation, providing you with a sterile test environment. Specifications Type of bottom: conical Capacity: 50 ML type: B-Flat bottom centrifuge tube with screw cap Material: PP colour: As shown Package Contents: 25 x Flat bottom centrifuge tube with screw cap 1 x orange 28 well test tube rack 1 x blue 28 well test tube rack 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.