The set includes 100 centrifuge tubes. They& 39;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 Smooth products, Features - Color: Random Lid Color. - Material: Plastic - Size: 9.5 x 2 x 1.5cm. - Specification: 10ml - Smooth products, good transparency, accurate measurement scale. - They& 39;re simple to fill and the lids fit tight.The lid elastic appropriate to high-speed centrifugal. - Featured with ball bottom and screw style, providing a safe, reliable and leak-resistant seal. - Suitable for storing samples, beads, essential oils, etc. can be stored at low temperature.