Key Features These speed cubes are made of safe ABS material. It is also a perfect choice for you to improve personal record in competitions! Super-durable, impact resistance, long lasting non-fading, safe for human and environment. Helps kids enhance hand-eye coordination and memory, stimulate their imagination and creativity, and keep them away from Mobile/Computer/TV. Play speed cube in spare time can relieve the work pressure of adults, and help elderly prevent memory loss.