With two 12.5-pound adjustable weights, you can quickly advance to a combined total of 25 pounds-easily customizing the intensity of your workout. The rounded plates, knurled grip and storage tray make this dumbbell comfortable and easy to use. The adjustment is a simple slider that moves quickly from one weight to another to keep your workout moving at a steady pace. These weights grow with you: as you get stronger, it's easy to up your weight without having to buy a whole new set of dumbbells. They store easily and don't require as much space as traditional dumbbell sets and racks.