York Fitbells are solid cast-iron dumbbells coated with thick vinyl for maximum comfort, safety, and style. The vinyl is durable and easy to clean. These brightly colored dumbbells are perfect for aerobics, jogging, power-walking, and general exercise. Sets come in 3lb, 4lb, 5lb, 8lb, 10lb, 20lb configurations. Packed in a convenient storage/carrying case.