Check the listing for details. Smithsonian Jet Works Science Build Your Own Jet Engine Model Kit NIB. Color: Multicolor, Condition: New, Made in China. Listed at 39.95 USD. The Smithsonian Jet Works Science Build Your Own Jet Engine Model Kit is a plastic unassembled kit that allows kids aged 8-11 to build their own jet engine model. This multicolor kit includes all the necessary building materials and is based on the Smithsonian franchise, focusing on aerospace subjects. With a skill level of 3 - Intermediate, this kit is designed for young builders to enjoy constructing a spacecraft model from renowned brand Smithsonian. Made in China, this 2 lb kit is a fun and educational toy that encourages creativity and hands-on learning This set has never been opened or removed from the box. Great to give as a gift this year. Hard to find is no longer sold in stores. Box is in good condition with minor storage wear. Please see pictures for better details.