.100% brand new and high quality. .Made of superior ABS material, non-toxic and lightweight, is completely harmless. .Big rounded corner design provides excellent fault tolerance. .Mushroom-like core design can fix all pieces at middle-level firmly, avoid pieces popping effectively. .Middle anti-sticking design makes it smoother to operate, brings you more pleasant experience. .Exquisite workmanship keep the rotation smooth and brings a comfortable hand experience. .Activate your imagination and creativity; improve your memory and hand flexibility. .Try your best to finish it and complete it. .Perfect choice for your leisure when on the road, it will definitely make the time fly and your brain cells to work over-hours.