Using 99.9% bio-grade polypropylene as raw material, it does not contain any heavy metals and metal ions. The surface is smooth, the product will not be contaminated during the manufacturing process, and the final product has glass-like transparency. The centrifuge tube can withstand a centrifugal force of 14000g and can withstand a maximum of 55psi; the screw cap cryotube is resistant to a centrifugal force of 20,000g. It is recommended for packaging, refrigeration, and long-term storage.