3 Resistance Stress Relief Balls,Physical Therapy Hand Exercise Balls Kits, Squeeze Balls Sets for Hand Finger Wrist Muscles Arthritis Training,Hand Grip Strengthening Train Ball Good toughness and washable A hand ball designed to activate different points in hand. Particle surface increase the agility of fingers and accelerate blood circulation. Excellent indoor equipment for office people, exercing indoors. Squeeze, roll or press the ball to relieve tension and reduce stress. It suits for primary strength training and rehabilitation training. Develop and strengthen grip, hands, fingers, wrists. * Relieve stress and muscle tension from computer work. Prevents stiffness, increases flexibility, and reduces joint pain. Size: 4.8cm / 1.89inch Color: Soft (Yellow), Medium (Red), Firm(Green) Weight: 50 g, 1.76 oz of each List Included: *3 x Silicone Gel Power Ball