I never heard of these magic balls before. Why not make your own? Save your yarn ends and bits and pieces and just tie them together. The only description that I found in the thread -
[I]For those of you unfamiliar with Magic Ball: it is a skein or hank of all different, color-coordinating fibers that are actually just tied together to make some yardage of yarn to knit with. The fibers are of all different kinds and weights and give a real funky, bohemian effect.[/I]
- and it says “all different … weights” so I think that might explain it for you.