Ergonomically shaped, all fingers can be trained at the same time. Two finger loops prevent them from falling out during training. The muscles of the hands and forearms recover faster with 10 minutes of daily use. You can use it at work and your stress and bad mood will be released. The massage ball feels comfortable, neither too hard nor too soft, can be rinsed with water after use. Human body design. The shape of the ellipse corresponds to the length of the fingers and fingers. The five fingers can be exercised at the same time, and the effect is better. Massage design Regular exercise can increase finger strength and improve finger flexibility String finger design Most users are inflexible fingers, and the string finger design is effective to prevent the ball from slipping. Breathable is not stuffy. The raised bump can effectively reduce the contact of the skin with the ball, the center is ventilated, and the palm does not generate sultry heat.