Built with100% 1st-grade silica gel.Our finger extensor exerciser has a small size and modern looking. You can use it while walking, traveling (car, airplane, bus), in office, school, watching TV or any place you want to exercise. If you suffer from mouse hand, arthritis, carpal tunnel, tendonitis, tennis elbow and are on the way to recovery from a fractured or broken wrist, or tendon surgery, then this is the perfect gripper for you. 3.75" L x 2.95" W x 0.24" H