How do you ship seats and heads?

I just shipped a set of heads. Wrapped them each in 3 layers of cardboard and taped them real tight. Then put each head in a seperate cardboard box and padded it really well with more cardboard. Must make sure the heads don't move in the box. They got to their destination without any damage. fully insure them just to be safe. Do not use styrofoam or popcorn!