🏋️‍♀️Premium Neoprene Coating: The premium neoprene coating makes these weights dumbbells set easy to grip and quick to clean, so it's perfect for sweaty, intense workouts. 🏋️‍♀️Solid Cast Iron: Each dumbbells set is made with a strong, break-resistant, solid cast iron core that has undergone strict weight testing with an error margin of less than 3%.