1、Durable Material: These centrifuge tubes are made of premium plastic material which is safer and more durable than glass test tubes, strong and reliable. 2、Screw Lid: Each plastic test tube is designed with screw lid that ensures excellent sealing performance, effectively prevent sample leakage and dangers. 3、Accurate Scale: These graduated centrifuge tubes are marked with accurate scale that can be easily read. The white writing area on the side is perfect for marking and identification. 4、Wide Application: These 50ml test tubes are ideal for small storage needs and can store gum, beans, biscuits, nuts, crafts, samples and liquids. 5、50 Pieces: You will receive 50 pieces of 50ml centrifuge tubes in total, suitable for scientific experiments, plant propagation and storage of cooking spices. 50 x Centrifuge Tubes(With Lid) Item Type: Centrifuge TubesMaterial: PlasticUses: Ideal for Beads, Bath Salts, Powder, Liquid Storage, Suitable for Scientific Experiments or Breeding Hydroponic PlantsProduct Size: Approx. 11.3 x 3.2 x 3.2cm / 4.4 x 1.3 x 1.3in ( Manual Measurement, Slight Error May Exist )