Features: Increase hand flexibility and coordination with the Hand Exercise Balls. Perfect for improving grip strength over time. Made of TPE material, these Hand Grip Strength Trainers are durable and resistant to deformation. Enjoy a comfortable grip experience. Suitable for all adults and teens with overused hands, these Hand Grip Exercisers are great for office worker, sports enthusiasts, and rehabilitation patients. Take your Hand Strength Trainers anywhere with their convenient and portable designs. Perfect for use at home, in the offices, or even outdoors. Surprise your friends, family, or colleagues with these Hand Exercise Balls. They make great gifts and can be used in various settings such as homes, offices, gym, and rehabilitation centers. Specifications: Material: TPR Type: Yellow 15kg/Orange 18kg/Green 20kg/Red 25kg/Blue 30kg Balls Diameter: 5cm/1.97inch Package Includes: 1X Hand Exercise Balls note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.