The special type of plastic used provides these tubes with a low adhesion surface and optimum sample yield.

No lubricant (such as silicone) is necessary, thereby eliminating the danger of sample contamination. It is also graduated and designed to withstand the stress of high speed centrifugation up to 20000×g. One-piece construction with a snug-fitting attached cap and a reinforced tube bottom is added for protection against leakage.