The Cylinder Block Set of 4 provides the complete series of knobbed cylinder work, supporting children in the 3–6 environment as they refine their visual discrimination of dimension and develop the pincer grip essential for later writing. Each block isolates a single variable — height, diameter, or both — allowing you to introduce the materials progressively and observe precisely where a child's perceptual understanding is developing. Having the full set of four ensures you can offer extensions and combination work as children move toward mastery.