The possibilities are endless with Hygloss Corrugated Geometric Shapes! Assortment includes 8 shapes, ranging in size from 2.5 inches to 5 inches. Corru-Shapes are made from sturdy (2.5 mm thick) white-coated corrugated card board. Let your imagination get the better of you as you sit down with Hygloss Corru-Shapes: corrugated geometric shapes. The sturdy corrugated cardboard has a smooth, white surface on both sides, which can be decorated with crayons, markers, paint, glitter, and more. Have fun creating any picture or object by putting various shapes together. Corru-Shapes are ideal for both home and classroom use. Highly educational and stimulating, use Corru-Shapes to introduce shapes to pre-preschoolers, explain geometry concepts to older children, and for unlimited arts and crafts ideas. These corrugated geometric shapes provide hours of constructive fun for children of all ages. 8 assorted shapes include: Circles, Semi-circles, Squares, Triangles (2 types), Rectangles, Diamonds, and Ovals.