3 years & up. A great manipulative to aid in classification, congruent vs. similar, fractions, proportions, comparing, patterning and more. Blocks are different in color, shapes, sizes, and thicknesses. Comes with plastic compartmentalized storage tray with sorter lid. The 60 piece set includes five shapes in three colors and two sizes with two degrees of thickness. Measures 3 1/2"W x 4 1/2"L.