[High-Purity Material] Centrifuge Tubes made from high-purity polypropylene material, and sturdy that features high heat tolerance, and good to excellent resistance. [Leak-Proof & Markable] 50ml Centrifuge Tubes have longer length screw caps with sealing ring, which is used to prevent sample leakage and it smooth, flat inner , no residual solution. [Clear & Accurate Scales] Plastic Centrifuge Tubes graduated with scales, allowing you see scales more directly and clearly; the graduation of these lab centrifuge tubes are very accurate, better for science experiments. [Wide Applications] The perfectly designed Plastic Test Tubes are general used in fields of biochemistry and molecular biology, such as separation and preparation of biological samples. [Package Includes] The package includes 100pcs 50 ml Conical Centrifuge Tubes graduated with marks and write-on spot attached blue leak-proof screw caps. Colour:Transparent Material:Plastic Package Contents: 100 * Centrifuge 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.