Hinged lid helps to prevent accidental lid opening and allows contamination-free lid opening. Well made with polypropylene which is highly resistant to chemicals, mechanical stress and temperature. Manufactured without the use of slip agents, plasticizers and biocides—substances that have been shown to leach from plastic consumables into the sample and negatively affect bio-assay results. Precise lid sealing for lowest evaporation rates during long-term storage. Designed with graduations help to provide an accurate reference, perfect laboratory supplies. Specification: Material: Plastic Color: As picture shown 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 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.