This Humanoid Silicone Finger Strengthener is made of food-grade Silicone, safe and durable, not easy to tear. It is washable so can be use frequently and comfortably. Strengthen your wrists, improve the dexterity of your fingers and increase the strength your hands can apply while reducing fatigue. It’s small enough so you can use it while walking, traveling (car, airplane, bus), in office, school, watching TV or any place you want to exercise.