What if there were somthing inside the balls that people could feel. would it take away from a routine or would it add to it? I think that people might try to feel for what is inside but am not sure if it would work or not.

If it ain't broken don't fix it. You can't improve on the sponge balls for effect and feel.

Although a different effect, Dean Dill sells a ball that LIGHTS UP.

That is what I was thinking of but didn't just want to come out and say it. For reasons I am sure that you can understand. If you have an idea you don't want to let it out right off the bat to the general community just bounce ideas off them.
Thanks I apreciate it

Roger

Jay Scott Berry shows this in his lecture using a heart shaped sponge and one of his finger fazers as a light.

You can use a d light in a sponge ball routine, and in the end just produce a large battery from the sponge ball while saying something along the lines " and if you are wondering how they light up, well to be honest they work on batteries.