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Package includes: 3 hand training balls, including 3 different hardnesses, yellow ball (13 kg), red ball (25 kg), green ball (35 kg). You can adjust the difficulty level to your level and improve your finger movement High-quality material: these finger training balls are made of environmentally friendly silicone, non-toxic and odourless, suitable for long-term and frequent use, safe, environmentally friendly and durable and are your high-quality choice Ergonomic design: the anti-compression ball has an oval egg-shaped design that fits perfectly in your hand. The surface of the finger trainer is slightly roughened to prevent slipping and increase comfort and training effect Portable and washable: The small and portable climbing ball for hand exercise can be carried with you and train your hands and fingers anytime and anywhere. The hand rehabilitation ball can be washed and kept clean Multifunctional pressure balls for adults: These anti-pressure balls can help you relieve stress, increase the strength of your hands, fingers and forearms, increase the flexibility of your fingers and prevent arthritis. Suitable for all types of sports enthusiasts