Tornado Balls are named because of the nature of the training you do with them. Fast and powerful rotational training (like a tornado) helps to develop your core muscles. Adds a new dimension to your workout Improve core strength and stability Develop fast twitch muscle fibres Improve explosive power and agility Rubber surface texture medicine ball and a durable nylon rope SPECIFICATION: Brand Origin Usage Home Use, Commercial Use Condition Brand New Warranty 6 Months