The Stamina pair of Versa-Bell II 12.5 lb. dumbbells is nine dumbbells in one. This innovative 2.5 to 12.5 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. The dial mechanism makes changing weight fast and easy for uninterrupted workouts. As you dial, the weight minder shows the weight you've chosen.