Hinged lid helps prevent accidental opening and allows contamination-free access. Well made with polypropylene, which is highly resistant to chemicals, mechanical stress, and temperature. Manufactured without slip agents, plasticizers, or biocides—substances that may leach from plastic consumables into samples and negatively affect bio-assay results. Precise lid sealing provides low evaporation rates during long-term storage. Designed with graduations for accurate volume reference, ideal for laboratory use. Specification: Material: Plastic Color: As shown in picture 10ml Size: Approx. 16 x 105 mm / 0.63 x 4.13 inch 15ml Size: Approx. 16 x 114 mm / 0.63 x 4.49 inch 20ml Size: Approx. 21.3 x 104 mm / 0.84 x 4.09 inch 50ml Size: Approx. 29 x 115 mm / 1.14 x 4.53 inch Package Includes: 10 Pieces Centrifuge Tubes