✔︎【3 Levels of Resistance】 Easy, Medium, and Heavy. The Hand Therapy Balls provide different resistance levels for beginners and advanced users. It can also relieve some of the tension and anxiety , ✔︎【Safety】With ergonomic design and unique textured surface, perfectly fit your hands. After repeated compression, it can still maintain its original shape, easy to clean and dry with a cloth, durable and safe , ✔︎【Portable】These stress relief toys set have a small size and charming egg shape looking. This is a really nice size because you can fit it in your scrub pocket and take it out to squeeze when you need to. Such as walking, traveling (car, airplane, bus), in office, school, watching TV, phone calling or any place you want to exercise , ✔︎【Material safety】The exercise balls are made of high-quality thermoplastic rubber (TPR) and food-grade silicone which keep it's original shape after repeated squeeze and stretch , ✔︎【Perfect For Children or Adults Of All Needs】 3 sets of Hand Exercise Stress Relief Balls are fun toys for children or adults; colorful colors can help children improve concentration and coordination, also suitable for people with hand muscle weakness and sensory processing disorder