The StrechCordz with Paddles adds resistance to the pull in dry-land practice swim strokes. It trains swimmers to keep hands flat while opposing every movement to increase strength and ultimately speed.áUsed by the United States Olympic Swim Team!áThe StrechCordz with Paddles includes two paddles connected to two 4ft/1.2 m tubes and a combination mounting loop. Sold as a unit only. No removable components or replacement parts. Not interchangeable. Available in five resistance levels. The Silver resistance has 3 - 8 lbs of resistance.