Blue J Model Rocket 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. $19.95  Dimensions Overall length : 24.34" Diameter : 1.637" (BT60) Forward Fin Span : 5.63" Weight : 3.15oz Recommended Motors Estes® C6-5 Single Use Aerotech® D10-7, D21-7 Reloadable Aerotech® RMS D13-7, D24-7 Challenges As a Skill Level 1 kit, the Blue J was designed for beginners and younger modelers, there are no real challenges in building this model rocket. There is, however, a small slit to be cut in the motor tube with a sharp hobby knife. This part should be done by an adult, or under adult supervision. Parts The Blue J model rocket kit includes illustrated instructions, pre-cut balsa fins, laser-cut plywood centering rings, two self-adhesive decals, translucent plastic nose cone, plastic parachute kit.