Children will explore patterns, symmetry, linear and area measurement, fractions and problem solving with these colorful blocks. Set of 250 include 25 yellow hexagons, 25 orange squares, 50 green triangles, 50 red trapezoids, 50 blue parallelograms and 50 tan rhombuses packaged in a plastic jar with lid. Lid has a built in handle. Pattern Blocks are made of plastic and are 0.2" (0.5cm) thick. Sizes range from 0.9" - 2" L.