The set includes 500 Pcs Centrifuge Tubes. They're simple to fill and the lids fit tight, no leaks. Smooth wall products, good transparency, accurate measurement scale, the lid elastic appropriate to high-speed centrifugal. These Micro Centrifuge Tubes are tiny, perfect for working with delicate samples. Features - Color: As shown.- Material: Polypropylene.- Specification: 2ml- Polypropylene, high temperature and high pressure sterilization- smooth wall products, good transparency, accurate measurement scale, the lid elastic appropriate to high-speed centrifugal.- They're simple to fill and the lids fit tight, no leaks.- Micro Centrifuge Tubes are tiny, perfect for working with delicate samples.Packing list: 500 x Centrifuge Tube