Velcor with one side of being sticky backed. You can then move your battery and reciever forward or backward at will. Typically the battery goes up under the fuel tank, so then you just lay some foam on the tank compartment floor and pack foam around the battery. I usually wrap my battery in foam and tape it on so as to protect the battery in the event of a crash. I also will wrap the reciever as well. Once again, Velcro strips will hold this foam in place. Good Luck, Dave