This marble run construction set allows kids to build an endless array of marble runs. Pieces connect easily, and the set includes 8 glow-in-the-dark marbles in a variety of colors. A full-color learning guide provides tips on building a great marble run, as well as insight into the science of motion and gravity.

This marble run construction set allows kids to build an endless array of marble runs. Pieces connect easily, and the set includes 8 glow-in-the-dark marbles in a variety of colors. A full-color learning guide provides tips on building a great marble run, as well as insight into the science of motion and gravity.