Feature:1. High quality stainless steel material, and exquisite workmanship to ensure absolute durability and structure, do not rust or fade.2. Hand‑eye coordination training, with different difficulty levels, suitable for different ages playing for stress relief.3. Releasing stress, relaxing your body and mind, which can also fully test your patience and concentration.4. Maintains brain activity and prevent Alzheimer's disease. Recommended for people above 14 years old playing.5. Can also increase the difficulty according to their needs. Young people play can relieve stress and old people play can exercise their brains.Specification:Item Type: Brain PuzzlesMaterial: Stainless Steel Quantity: 8pcs Recommended Age: 14 years and older, younger people can relieve stress, older people can exercise the brain to prevent Alzheimer's disease. Package List:1 x Brain Puzzles #11 x Brain Puzzles #21 x Brain Puzzles #31 x Brain Puzzles #41 x Brain Puzzles #51 x Brain Puzzles #61 x Brain Puzzles #71 x Brain Puzzles #8