Kids will have a blast assembling pull-back rocket crafts, then launching and racing them into the stratosphere. These rocket activities soar as a DIY space birthday party favor or a STEM craft kit giveaway that introduces kids to the basic principles of aerodynamics in a fun, interactive and creative way. Includes self-adhesive foam pieces and plastic pullback wheels. 10.2cm x 4.45cm Makes 12. All craft kit pieces are pre-packaged for individual use. Kits include instructions.