What is a good toy to get my bengal cats to jump real high with?

I have 3 bengals, two who are 3 1/2 years old, and a 11 week old kitten. The 3 1/2 year olds use to jump SUPER high, not as much any more. Any suggestions on a good toy for them and the kitten to jump high?|||I have Ocicats who also like to leap. I use a simple piece of rabbit fur on the end of a leather strap and use it like a fishing rod. They love to jump and catch the "bunny" and will try to pull it out of your hands.|||Have you tried one of those feather things on a stick? It drives my cats nuts. I love the way they fly through the air to grab it.