A fun, hands-on way to demonstrate physical science concepts and an absorbing outdoor activity, too. This solid wood, hand-powered mini-propeller could complement explorations of physics (hand-to-rotor energy transfer), botany (models a maple seed in flight), mechanical engineering (models a helicopter rotor)... A quick spin sends it twirling. Sanded smooth with an 8" wing span on a 7½" stick. Made in U.S.A. Categories: Montessori Supplies Montessori Materials At Home > Classic Toys & Just for Fun