Resistance from dumbbells never changes, while the resistance from tubing increases throughout the exercise motion. The Heavy Handles with Tubing combines two variations of resistance making the exercise motion more effiecient in toning and building lean muscle. Create a body sculpting program that will tone you from head to toe, and help you gain up to three times as much strength than traditional weight training alone. Twice the workout in less time. Pair of 2 lb weighted handles. Medium tubing included. Workout guide included. Size: 2 lbs.