This set includes 60 Relational Attribute Blocks in 5 shapes (circles, squares, triangles, hexagons, rectangles) 3 colors (red, yellow, blue), 2 sizes, and 2 thicknesses. The set also includes an activity guide. Relational Attribute Blocks have proportionally sized shapes. The small shape is 1/4 the size of the corresponding large shape, which assist children in learning fraction concepts. Develop logic, problem-solving and critical thinking skills as children learn to identify, sort and classify by attributes – size, thickness, color, and shape. The set is packaged in a plastic container with sorter lid for easy cleanup and storage. Size of small rectangle: 1.5"L x 0.75"W. Size of large square: 3"W. For ages 3+.