Cone Sorting - Unit PlusLearn about height, depth, size, and sequence by sorting and stacking these colorful cones and cylinders in the PlanToys Cone Sorting set. The set comes complete with nine pieces. Compatible with other block sets in the Unit Plus series. These nesting cones and cylinders will bring children delight as they stack and nest them together Great visual teaching aid when learning about shapes, colors and patterns. This set is part of the Unit Plus series