1Natural latex manufacturing, high quality and environmentally-friendly. 2Help to stimulate your interest in sports, achieve better training results, and improve your life taste. 3Tensile strength is strong and not easy to age, doesn't have to worry about broken even in intensive training. 4Can strengthen your muscle and improve your balance, mobility and flexibility effectively. 5Suitable for fitness, muscle training, balance training, explosive power training, roller skating resistance, and yoga stretching.