Created to comply with TSA's Flight Challengenational flying event. This includes TSA specified balsa blanks for wings, fuselage and tail assembly, clay ballast, Bsize graph paper and Designer outlines. Supplies enough for 24 students, except for the teacher's manual. The TSA specified Catapult Kit, is supplied separately. It includes enough rubber to create 2 loops to TSA requirements. 24 Kits.