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Adjustable strength! Adjustable strength! Adjustable strength! | Say important things three times
|Easy to use, random, flexible, without any restrictions, the effect is magical, the effect is unimaginable, the grip is well-deserved, and the most important point is easy to persist, the more you practice, the more powerful, the more you practice, the more confident
Regular exercise of the muscle strength of the ten fingers can maintain the dynamic balance of the muscles of the fingers, toes and the whole body, which is beneficial to the body