THERABAND Soft Weight, 4.5″ Diameter Hand Held Ball Shaped Isotonic Weight for Strength Training and Rehab Exercises $20.31 – $41.99 Make sure this fits by entering your model number. A soft alternative to traditional isotonic dumbbells which provides users more versatility for strength training and rehab exercises Hand-held, ball shaped weights allow for unilateral or bilateral exercise progression, easy use with balance training and stabilization exercises or with a rebounder or mini trampoline for plyometrics