Axygen's polypropylene tube strips and cap strips are specifically designed for PCR use and are ideal for thermal transfer applications. The ultra-thin and consistent tube walls ensure that thermal transfer is precisely even along the surface of the tube. The unique cap design guarantees a perfect fit to prevent sample evaporation during thermal cycling. Tubes are made from highly polished molds and are free of lubricants, dyes, heavy metals, and fillers. Tubes and caps are certified by lot number to be RNase-, DNase-, and pyrogen-free.