Premium Material: Premium silicone is carefully selected for hand training, which is soft, elastic and very skin-friendly. The exceptional flexibility and flexibility of the material make the fingers and palm feel comfortable and activated when using Ergonomic Design: The four small rings are arranged side by side for the fingers so that you can grasp the ring more firmly. When training, the ring will not fall off. In addition, it is designed according to the shape of the palm of the hand instead of round, while the convex points at the end improve the grip Environmentally friendly and durable: Nothing toxic or harmful is produced from the raw material to the finished product. The material has stable properties which results in a longer service life (temperature range from -40 to 240). It is robust, easy to wash and dimensionally stable The dimensions are approximately: 1010cm Multifunctional: The hand rehabilitator not only exercises the grip strength of the fingers, but also strengthens the muscle strength of the forearm, reduces stress and activates brain cells because the acupuncture points of the brain reflex zone are focused on the palm and are thus stimulated. Simply practical and useful Easy to use - With a medium size and a weight of about 100 g, this strength training device is very easy to carry in trouser pockets, so that strength training can be carried out anywhere and at any time. It is easy and comfortable to use, while bringing a lot of fun and obvious effects