Welson Chen made this yoyo for Ringsted Unicef By 2016.
https://lh3.googleusercontent.com/m5ssC6LEo3uDANU6Me4bN3PqhoOQz-cQFOg-gWbZiJeRGNSdPdBsgAEVo8BNP7ftnbjV=s152
Material: aluminum 6061 Weight:66 gram Diameter:52 mm Width:38.35mm10 balls Stainless Steel centertrack bearing(Size C).
Its unresponsive stable and just awesome.
more pics: https://www.facebook.com/project-demark-The-yoyo-in-the-school-255079797839893/