Make sure this fits by entering your model number. Speed Helper：Experiments have shown that two 56-inch diameter parachute can produces 26-60 pounds of resistance.The faster the speed, the greater the resistance will be.Use of this resistance training chute will make your speed breakthroughs. Upgrade Buckle Belt：With adjustable heavy-duty nylon belt suitable for almost any athlete, plug and play, convenient and fast. The metal D-ring rotates 360 degrees, which means you can sprint in any direction.