Bundy,
The balls are 86 mm...that's huge for multiball, but I have large hands and I gain in visibility.
64 mm...hmm, this sounds really tiny...afraid that the spheres disappear(!) in your hands.
In fact you have choice between the two main family in CJ:
- Palmspining and
- Bodyrolling.
For the later a 100 mm stage ball is recommended as you don't bother dropping it and/or damage everything around you...
It's very light, so you can learn faster than with an acrylic one.
There's a good alternative for multiball: the wooden balls > there're much cheaper than acry. and feature almost the same amount of friction.
You couldn't work multiball with plastic or slicone balls, unless to work with the balls always separated, which really difficult and advanced technique.
I'll suggest you visit
this site.
There are tons of useful infos and advices, as well as free articles to begin with.
Plus people there are very friendly and willing to help beginners.
On a personal point of view, I would say get also an acrylic, say a 80 mm one, just to enjoy the beauty and inner properties of what is basically a big round lens!!
My first sphere was a 100 mm one, and yes I learned the hard way!!
Good luck!