Rocketarium #RCTBLUEJ. The Blue J was designed especially for new rocketeers, with little or no experience, and younger modelers. As this is a Skill Level 1 model rocket kit, the balsa fins are pre-cut for quick and easy assembly. This kit includes illustrated instructions, large decals, parachute kit, and other parts needed to build this rocket. The Blue J can be launched on commonly available C6-5 model rocket motors, and composite 18mm D motors.