Conical Sterile Polypropylene Centrifuge Tubes are premium, high-quality conical tubes that are environmentally friendly, allow for increased traceability with the largest writing area on the market. Centrifuge tubes are made from high-purity resins and molded using our state-of-the-art processes. Centrifuge tubes is a safer alternative to glass without sacrificing accuracy. Centrifuge tubes feature black printed graduations and a large white marking spot. Available with your choice of cap styles: the advanced cap or the original plug seal cap. Sterile, RNase-/DNase-free, Nonpyrogenic.