The set includes 10pcs centrifuge tubes. They're simple to fill and the lids fit tight, no leaks. good transparency, accurate measurement scale, the lid elastic appropriate to high-speed centrifugal. Great choice for general-purpose and laboratory use, adapted to centrifuge and widely used in clinical chemistry, molecular biology, bio-chemistry and other experiments and researches. Features - Color: Transparent. - Material: Glass. - Size: 12.20X2.00X1.00cm/4.79X0.79X0.39 inch. - Specification: 15ml. - 15ml test tubes have longer length screw caps, which is used to prevent sample leakage and it smooth, flat inner surface, no residual solution. - 15ml conical tubes With a large unerasable frosting white printed writing area provide easy and legible mark, and both the graduations and writing areas are chloroform-resistant. - Widely used in molecular biology, clinical chemistry and biochemistry research, very suitable for processing precision samples and storing small samples. - Suitable for storing samples, beads, essential oils, etc. can be stored at low temperature. - Adopts precision production to the stable characteristics and high reliability.