Montessori Cylinder With Socket 4pcs/Set Family Version Montessori Materials Early Learning Tools Montessori Toys for Toddlers Training kid's visual discrimination of high and low, big and small. Large wooden knobs for easy grasping.Through observation, logical reasoning, analysis and other forms of thinking, help children learn to reason, draw conclusions.Purposes: Direct ?Visual discrimination of dimensions. Indirect?Preparation for writing; coordination of the fingers used to hold the pencil.?Refinement of voluntary movement. The child will be able to fit the cylinders with one precise movement.?Preparation for mathematics.Specifications: Material: Wood Single socket dimension: 5.8*1.6*1.4in; Total socket dimension: 5.8*6.3*1.4in; Weight: 1.33lb or 0.6KGPackage Included: 4 sets cylinder blocks with socket, each cylinder fitting into its respective hole. Cylinders varying in height and/or diameter in each block:Block 1: The cylinders vary in one dimension: The diameter remains the same, the height increases. Block 2: The cylinders vary in one dimension: The diameter increases, the height remains constant. Block 3: The cylinders vary in two dimensions: The diameter increases, the height increases. Block 4: The cylinders vary in two dimensions: The diameter increases from, the height decreases.