Walker Tapes – Pro-Flex II Tape Roll is a very popular Hypoallergenic Hair Replacement System Tape and Hair Extension Tape makes attaching hair replacement and hair extension wefts easy. Its made with Urethane, which makes for a very flexible bond. Usually the most tacky, it requires more skill to apply. Pro-Flex II Tape is available in all standard Shapes and Roll Sizes. Depending on temperature, humidity and body oils Pro-Flex II Tape can last for up to 4 weeks.