Introduction-our ab roller wheel are made from 100% eco-friendly natural latex which support repeated high strength stretching.it is more durable than the previous material in the market!(when buying, please look for the "lolicute " store. other stores sell products, not authentic.) ergonomic&comfortable to use-eva kneeling board, ergonomic, large-sized and anti-slip.flexible wheels with soft sponge cover and hand rack, comfortable to use.six different training levels for your choice to achieve the maximum body fitness. overall function - ab roller wheel with elastic bands for arm workout, strengthen your upper,