Ask @GSquaredyoyos:

Have you considered trying to produce a Bi-metal yoyo? Many think they're the future and a G2 take on them would be amazing.

If you just are talking 6061 and 7075 it's really not worth it. It's kind of gimmicky. If you are talking 6061 and stainless steel or titanium then you can do some really cool stuff. With that said I haven't looked at the YYJ patent to see what exactly they own the rights to

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