Roller for Camera Slider

First try to recreate the rollers used in https://www.youtube.com/watch?v=GE37xI14Fyw (http://www.thingiverse.com/thing:1373489)
I couldn't get the rollers linked in the description of the video shipped to me, so I drew them myself.

I haven't got the chance to test these yet.
They do fit standard skateboard bearings (22mm outer diameter).