Rockbag Handmaster Plus, Hand and Finger Trainer, Ergonomically shaped softball for finger, hand or forearm muscle training, Offers valuable muscle training for all musicians, Suitable for use on both hands, For training of fingers, hands and wrists and forearm muscles, Strengthens flexor and extensor muscles, joints and the carpal tunnel, System recommended and used by specialists worldwide, Medium resistance / strength, red, special rubber strap for training the extensor muscles, Includes 2 different rubber straps to adapt the Handmaster Plus to hand size and strength