Ready to take on students making their own holes for paper engineering with mechanical linkages? This pack delivers 600 pieces of card stock to get your students started. Includes a variety of colors in 30 different shapes (20 of each shape). These are materials for Unit 2 Focus Lessons, and colors may vary. Requires making small holes for linkages – we recommend the Push Pin Paper Drill Kit. Also requires brads for assembling, sold separately.