Everyone run out to "the Dollar Tree" if you have one in your
neighborhood! In the cheap kids toys section, they have what are called
"Whirly Balls", they are 4 for $1. Kind of hard to describe....you know
how when you peel an orange all in one long strip and you can take the
skin and form it into the shape of an orange? They look kind of like
that. A spherical spiral, for the lack of a better way to put it. Whats
more is that on the inside of the "sphere" there is a sort of
zig-zagged piece that run across the center of the sphere from one side
to the other. They are made of white plastic and kind of have a rough
textured finish. They are about the size of a baseball, maybe a little
bigger. These things are perfect and cheap!