Children will explore patterns, symmetry, linear and area measurement, fractions and problem solving with these colorful blocks. Pattern Blocks Kit includes 20 activity cards, 250 plastic pattern blocks, and a set of 2 trays. Activity cards are printed on sturdy card stock measure 8.5" x 11". The 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. The tray set includes a triangle tray and a hexagon tray. Triangle tray sides measures 13.9". The Hexagon tray sides measure 6.5" L. Lips on trays keep pattern blocks from sliding off.