Description: 【Adjustable Resistance for Growing Children】: This hand grip strengthener is designed specifically for children, with adjustable resistance levels to help improve their grip strength as they grow. Perfectly for enhancing stability when holding a pen and writing 【Two Elasticity Levels】: Kids Hand Grip Strengthener, easily switch between two resistance settings to suit different age groups. Open the air valve for 10 of resistance, ideal for kindergarten to third grade, and close it for 15lbs, suitable for fourth to sixth graders 【Comprehensive Hand Training】: Featuring a high design, this Finger Exerciser tool provides comprehensive training for fingers, palms, wrists, and arms, helping hands become and more coordinated 【Ergonomic Four Finger Grip】: The Hand Exercise Ball four finger positioning ensures a stably grip that activates with each squeeze, making it easy and effective to use during exercise parts 【Comfortable Soft Silicone Material】: Hand Grip Strengthener for kids, made from soft silicone that feels incredibly comfortable in the hand, encouraging regular use without discomfort Specification: Material: Silicone  Size Chart: 10.5cmx7.5cm/4.13inchx2.95inch Package Includes: 1 Hand Grip Strengthener Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.