New Millennium Grip Strength Trainer – 4-Pack Foam Hand Therapy Block Exercisers for Hand & Wrist Rehabilitation, Carpal Tunnel, Arthritis, Tendonitis – Made in USA, Color-Coded Resistance

Customers find the hand strengthener effective for strengthening hands and wrists, with one mentioning it works well for wrist surgery recovery. They appreciate its utility, with one customer noting it's helpful for performing exercises between physical therapy sessions. The resistance levels receive mixed feedback from customers.