Features: Package includes: 25 pcs 15ml OR 50ml centrifuge tubes with leak-proof screw caps. Made form quality plastic material, waterproof, durable. Plastic centrifuge tubes is accurately and clearly graduated, so these lab centrifuge tubes are better for science experiments. Very suitable for the fields of biochemistry and molecular biology, such as separation and preparation of various biological samples. Apply to loading solid, powder, liquids, oils, pills, and other objects, etc. Each centrifuge tube with conical bottom. Can be used as sample storage vial, lab test tubes, sample storage container. Environmental friendly and non-toxic, they are also reusable after clean. Widely used for scientific research laboratory, hospitals, epidemic prevention station, school, also great for organizing small items in the workshop and home. Specifications: Material: Plastic Color: Transparent Type: 15ml; 50ml 15ml Tube Size: Approx. 12cm/4.72in 50ml Tube Size: Approx. 16cm/6.29in Weight: Approx. 380g； 430g Package Includes: 25 Pieces Plastic Centrifuge Tubes with Screw Caps note: 1.Please allow 0-1cm error due to manual measurement. make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you