The Shape Stacker is a high-quality Montessori toy that is perfect for young children. The stacker helps little ones work on their gross motor skills and provides wonderful tactile experiences. It is 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.