MSI Brand screw cap microcentrifuge tubes are strong enough to withstand centrifugation up to 20,000 x g. Suitable for use in vapor-phase liquid nitrogen storage, -80°C freezers, boiling, and autoclaving. Deep external threads protect against sample loss and seal failure. An interior U channel in the lid keeps the ethylene propylene rubber (EPR) \"O\"-ring in place as the cap is tightened. RNase, DNase, DNA, and pyrogen free. Graduated with frosted writing surface. Autoclavable

• Item Packaging: 1000 per case