Attribute Blocks are a set of Geometric Shapes.
Attribute Blocks come in 5 shapes:
Each shape comes in a large and small size.
Each large and small size comes in 3 colors: red, yellow, and blue.
Attribute blocks are very versatile manipulatives for kids and can be used in many areas of math to teach many different math concepts including:
Here are links to Attribute Blocks Resources.
Attribute Shapes Printable (for Grades 1-5)
Introduction to Algebra for Primary Students
Amazon has a selection of Attribute Block Resources.