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Young children can design and construct their own giant roller ramps. Students snap together the large plastic pieces in any configuration, then launch an included plastic ball and watch it twist and turn through the ramps. Inclined plane. The longest ramp piece measures 12". Contents: instruction sheet, 24 straight track sections, 8 corners, 4 U-turns, 14 bases, 26 base extensions, and 4 balls. | |