TheraBand Soft Weight 6 Piece SetHand held, ball shaped isotonic weights, TheraBand Soft Weights are a soft alternative to traditional isotonic dumbbells providing users more versatility for strength training and rehabilitation exercises. They are unique because the size of the ball, with a diameter of 4. 5", does not increase as weight increases, allowing for a consistent and functional grip. This allows for either unilateral or bilateral exercise progressions, either independently,