Zip System Liner Stretch Flashing Tape easily stretches to fit sills, curves and corners with a single piece without having to piece tape segments together. This avoids seams or joints. Made of a high-performance composite acrylic, the tape conforms to challenging applications and locks out moisture even over mismatched surfaces. And Zip System stretch tape can be pulled up and reapplied for hassle-free installation, providing a tight, energy-efficient seal in no time.