Yingfa in-water resistance band allows swimmers to develop their endurance capacity, stroke efficiency and correct technique, such as proper hip rotation. Which Length To Buy Diameter / Length Recommended 13mm / 4m Kids above 12 years of age, adults, general swimmers 13mm / 7.5m Profesional swimmers Builds strength and endurance Small and lightweight cords for easy travel Material: Cord (Silicon) Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item.
