You can’t really DIY the super nova, cut some angles into a softball?  No. 

You can kind of glue two lax balls together to make the gemini, but not quite the same hardness, and multitaskability.

I think the price point of this threw me for a loop.  I realize the materials cost way more than the other two since there’s bearings etc.  This seems like a bunch of roller hockey skate wheels on a stick. But, then, I looked up the cost to DIY this, and damn roller hockey wheels are expensive.  Think I’ll be picking this up.