The Stamina pair of Versa-Bell II 50 lb. dumbbell is nine dumbbells in one. This innovative 10 to 50 pound adjustable dumbbell replaces nine individual dumbbells, but is the size of one so you save space and money without sacrificing quality. It's the perfect way to add dumbbells to your home workout area. Just set the dial to your weight of choice. The dial mechanism makes changing weight fast and easy for uninterrupted workouts. As you dial, the weight minder shows the weight you've chosen.