Wash Bottles features: Glass test tube elbow joint is designed to perform under a variety of experimental conditions. Capable of high temperature, as well as centrifugation, our test tubes are assured to serve in a wide array of biological and chemical sample preparations. Features Color: Transparent Material: Glass Size:10.70X3.60X3.60cm/4.21X1.41X1.41inch Transparent appearance, easy to observe, to ensure the effectiveness of centrifugal experiments These test tubes are no bubbles, no impurities, high speeds centrifugation The elbow design can reduce the pollution caused by the experimental operation Premium glass material with high transparency for easier observation Widely used in laboratories, suitable for pigments, chemical experiments, biological experiments.