The Pressure Cylinders are a Sensorial material designed to develop the child's baric sense — the discrimination of weight and pressure independent of visual or auditory cues. Children work with matching cylinders by feel alone, refining their ability to detect subtle differences in the resistance or weight of objects, which builds the discriminative attention that supports later scientific observation. This material is a valuable complement to the Baric Tablets and fits naturally into the Sensorial sequence for children in the 3 to 6 environment who are ready to isolate and explore the sense of pressure.