ROCKBAND FLEX - one band for mobility, flexibility and strength Forget latex and rubber. RockBand Flex is your all-in-one rehabilitation, stretch and mobility solution. Available in three resistances, RockBand Flex unlocks a universe of movement improvement and is designed to be washable, portable and infinitely reusable. Made from a proprietary cotton-nylon blend, with 6-inch loops spaced equally on each half of the band, Flex allows you to use one tool to rehabilitate injuries, improve mobility and increase strength. Resistance Weights - Light - (12-18 Lb) - Medium - (18-22 Lb) - Heavy - (22-28 Lb) Light: perfect for stretching and rehab exercises, and especially for patients starting rehab exercises, or for children or elderly patients. Medium: not too light and not too heavy; just right for most people! Use for yoga, rehab, stretching and more. Heavy: perfect for resistance training and stretching.