Cast iron wrapped in a thick coat of durable neoprene for a comfy grip that is gentle on hands and doesn't require gloves Stylish and modern look with bright, color-coded weight increments and large, clear numbers; It's quick and easy to grab the right weight for your routine Oblong design resists rolling, while the thick handles enhance and strengthen grip Compact size is easy to store and perfect for travel; Easy to clean neoprene is great for indoor and outdoor use Heavy weight exercises build muscle mass and strengthen the core; lighter weights add resistance to aerobic exercises and jogging, physical therapy, even yoga