Come and see our amazing products. Experiments have shown that a single 56-inch diameter parachute can produces 12-33 pounds of resistance. The faster the speed, the greater the resistance will be. You can also increase the difficulty of sports by adding 1-3 resistance parachutes, and make the speed a breakthrough. The training parachute is suitable for all sports that requires explosive force and acceleration training, such as track and field, football/soccer, basketball, skating and so on. Pls confirm with us about the packing info, stock color and exact production time before placing your order.