Children put STEM into action with our hands-on challenge kit! This engaging kit includes 5 challenge cards to prompt kids as they plan, create and test a toy paddleboat. Children assemble the paddleboat and wind up the paddles with a rubber band to experiment with force and motion. Kit includes a sturdy foam boat hull, 16 plastic paddle pieces, 10 rubber bands, 5 challenge cards and an activity card. Boat hull measures 5" x 7 7⁄8".