This polypropylene thin wall PCR tube cap is for 2mL tubes. The unique cap design guarantees a perfect fit to prevent sample evaporation during thermal cycling. Made from highly polished molds and free of lubricants, dyes, heavy metals, and fillers. Certified RNase, DNase, and pyrogen free to ensure the purity of your reaction. 8 Caps Per Strip. Material: Polypropylene. Size: 0.2mL. Color: Assorted. Corning Axygen® #: PCR-02CP-A.