Set Of 4 boxes with lid colour Yellow, Red, Blue, Green having cylinder of the same colours respectively varying in height and / or diameter in each box. 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 from 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.