E&O Montessori Set of Knobless Cylinders

4 sets of 10 cylinders varying in height and/or diameter in each set. Each set is in a separate wooden box with the lid painted the same color as the cylinders: red, green, yellow, and blue.
Develop a child's visual perception of dimension. It also provides experiences in comparison, and grading - indirect preparation for mathematics.
Dimensions of each wooden box: 6.5 x 4.5 x 2.75 inches
Information: also called the knobless cylinders, the colored cylinders are the same dimensions as the cylinder blocks mentioned above.

There are 4 boxes of cylinders:
Yellow cylinders that vary in height and width. The shortest cylinder is the thinnest and the tallest cylinder is the thickest.
Red cylinders that are the same height, but vary in width.
Blue cylinders that have the same width, but vary in height.
Green cylinders that vary in height and width. The shortest cylinder is the thickest and the tallest cylinder is the thinnest.

The child can do a variety of exercises with these materials, including matching them with the cylinder blocks, stacking them on top of each other to form a tower, and arranging them in size or different patterns. When the yellow, red, and green cylinders are placed on top of each other, they all are the same height.