Frenchy has the green 65cm egg ball. When he wrapped a rubber exercise band around it for hopping and said it worked very well I got my own, and he's right.
The eggball is from the same maker as the Hop 66 and is the same vinyl, but the oval shape gives bouncing around on it more of a stable, horseback feel...maybe now can I see the appeal of the giant sized Rody hoppers, which I really didn't get before.
This thing is a lot of fun and is rated at over 800 lbs, so it's big enough for two (if not, they have an even bigger blue one). All you need is a 60 inch band to stretch around the middle and tie in a knot, and that's your handle.