Deluxe Plastic Pattern Blocks Author:School Specialty Publishing Pattern Blocks - a versatile manipulative no math class should be without. These Deluxe Plastic Blocks are 1cm thick and include green triangles, red trapezoids, blue rhombuses, tan rhombuses, yellow hexagons and orange squares. Use them to teach geometry, symmetry, fractions and more. Includes 250 blocks made of sturdy plastic. Packaged in ... more »a clear plastic jar.« less