Features 1. Enhance grip strength and relieve stress: Pressing the pressure ball can strengthen the muscles of the hands and forearms, improve finger flexibility and agility, relieve hand fatigue. It is simple and effective, helping to enhance grip strength, recover from injuries, release pressure, and improve endurance. 2. Design of finger strengthening training ball: The squeezing of this finger ball is just right, which can enhance our hand strength. These handles that enhance hand strength can effectively grip the ball in the hand during exercise, without creating a sense of restraint or affecting the arrangement of fingers during use. 3. Personalized five finger button: Each finger can easily increase the force required to press each piston, and the silicone rubber pad makes the palm and fingertips feel comfortable. 4. True finger strength training changers: These hand trainers are perfect for guitarists, office workers, pianists, musicians, artists, artisans, woodcarvers, web designers, and more. A must-have for exercising finger strength. 5. Thoughtful Gift: The grip enhancer is perfect for giving to friends and family on Thanksgiving, Father's Day, Mother's Day, birthdays, and other holidays. Bring a more relaxed and healthy lifestyles to your family and friends. Specification Product Material: ABS/PET/Carbon Steel Bullet Yellow Optional strength: Soft version -20KG - Strong version -45KG Optional strength: grip strength training, finger strength training Package Include: 1x Wrist Trainer Tool