This is the R/C Universal Radio Case intended for use with the ProTek R/C Universal Radio Case and Futaba 4PX. This high density foam insert will allow you to adapt the Universal Radio Case to fit the Futaba 4PX radio, keeping your valuable equipment safely cushioned within the case. But, this insert feature more than just a cut out for your transmitter! Additional pockets have been added so you can keep spare servos, receivers and other accessories tucked away safe and secure, within easy reach when you need them.