N.J. Stat. § 21:1C-1
As used in this act:
"Model rocket" means a commercially made rocket that is propelled by a rocket motor; that contains a device for returning it to the ground in a condition to fly again; whose structural parts are made of paper, wood, or breakable plastic and contain no substantial metal parts; and whose primary use is for purposes of education, recreation, and sporting competition.
"Rocket motor" means a device that provides the necessary force or thrust to cause a rocket to move and the force or thrust is created by the discharge of gas generated by combustion, decomposition, change of state, or other operation of materials completely stored within the rocket motor during the commercial manufacturing process and requiring no mixing of propellants.
N.J.S. § 21:1C-1