No rocket assembly required - it's ready-to-fly! Each T-Minus 5 Model Rocket Set combines a K-1 Series Ready-To-Fly (RTF) model rocket and a complete launch system. Almost everything you need for a day of flying model rockets. This package provides a great introduction to basic model rocketry. Comes in sturdy re-usable range box. ENGINES NOT INCLUDED! A6-4 engines recommended for the first flights.