It's lead weights made for to your lipo powered cars, either to make minimum weight or to equal the weight of nickel packs so handling is the same.

It's the easiest most effective way to get it done... all my racing buddies were switching to lipos and having trouble finding a good way to make the lipos fat like our nickel packs. So we made this...

Heres a link for info: www.teamfusionracing.blogspot.com (http://www.teamfusionracing.blogspot.com/)