Time-tested and appealing, our Attribute Blocks are made of a tough, colorful plastic and designed to stand up to years of classroom use. A must-have manipulative for teaching sorting, classifying, and critical-thinking skills. The smooth circles, squares, rectangles, triangles, and hexagons come in three colors, two sizes, and two thicknesses each. Includes 60 blocks packaged in a clear plastic jar with activity sheet.