442 KíNEX pieces plus 2 battery motors, 2 flywheel motors, and 4 transparent spring motors. Build 11 models, up to 4 simultaneously using the color-coded instruction books (4 sets). Comprehensive teacher’s guide with 7 injury-based lesson plans. Supports 8 to 12 students working in teams of 2 to 3. Stackable storage case with movable dividers and a snap-on lid.