This set of wooden puzzles feature cause and effect and problem solving challenges. Mix and match geometric shape blocks with wooden gears on the pegged puzzle base. Then place the gears into the fixed axes and turn the handle to move the gears. The gears of same size are exchangeable to make different combinations. Pegged puzzle base measures 28cm L x 11cm W x 9cm H (11" L x 4½" W x 3½" H). Ages 18 months+.