PlanToys Wave StackerProduct Description The PlanToys Wave Stacker is a multi dimensional building and stacking toy. The different sized waves are easy to grasp and are open ended for way to stack them with one another. Can be used with existing stacking rods and base plates Stack in a multitude of ways Strengthens fine motor skills, supports logical thinking and improves problem solving Sustainably made in Thailand using chemical free rubberwood, formaldehyde free glue,