Made from cast iron with neoprene coating, this dumbbell set is sturdy and durable. The neoprene coating is not only soft, but also nontoxic. This cast-iron dumbbell has a contoured non-slip handle that offers a comfortable grip. The hexagonal shape ensures that the dumbbell doesn't roll off when it is not in use. As you progress, you can add more weights to intensify your workout. This dumbbell comes in an attractive range of colors and can be easily stacked. This neoprene coated dumbbell is perfect for workout in the gym or at home.