Through Pattern Blocks, kids develop an understanding of geometry, shape, symmetry, tessellation, angles, measurement (perimeter and area), algebra (patterns), and numbers (fractions). Set includes 120 plastic pieces in 6 standard pattern block shapes and colors: orange square, blue rhombus, red trapezoid, green triangle, yellow hexagon and beige narrow rhombus. Also includes Activity Guide. Size of hexagon: 2"W. Packaged in a jar with lid and carry handle.