Each box contains 10 finger straps, 30 stainless steel weights (3 per finger) weighing 10 grams each, weight adjustment tool, carrying pouch and instructions. Musicians, Athletes, Gamers, at all levels, as well as people recovering from finger / hand injuries, incorporate FingerWeights into regular practice, training and rehabilitation sessions. Most feel the effects after first use. Hand Speed, Dexterity, and Finger Strength in the extensor and flexor muscles, the fine motor muscles in the hands that open and close the fingers, are essential elements of better play. FingerWeights isolate these muscles in a safe and effective fashion while you're practicing, training or rehabilitating. For musicians, these are ideal for use with both string and wind instruments.