The natural Shape Stacker introduces 4 basic educational concepts.Shapes - the shapes are a triangle, square, pentagon, hexagon, octagon, and circleShape Names - each of the shapes have the name of the shape engraved in the sideNumbers - each of the sides of the shape have a number engraved on the top; triangle has 1-2-3, square 1-2-3-4 and so on.Patterning - smallest to largest sizeThe stacker also helps little ones work on their gross motor skills and provides wonderful tactile experiences. Made from locally, sustainably harvested, solid hardwood maple, each piece is sanded smooth with engraved details.The entire stack measures just shy of 5" tall (each piece is 0.75" thick) and the largest shape, circle, is 5.7" across.The dowel to hold the pieces is a hefty 1" thick. Made in USA