Here's what I have for free just pay shipping:
5 noise supressors for the Rx
modified crawler frame for E-Maxx
1.9 tires I think
2 scale bodies
also not in the photo is two sets of Maxx size tire foams
You make a couple of wraps around it with your ESC lead going to the Rx and close it. It will help with radio iterference like that caused by Brushless systems on AM radios. I use one but I also use 2.4Ghz radio now too.