Stamp 3D geometry stamps are great as they are durable and reusable. Hence these 20 quality stamps make set work and discrimination activities easy. Containing regular and irregular plane or 3D shapes. Set includes: circle, oval, square, rectangle, pentagon, hexagon, octagon, decagon, equilateral triangle, right angled triangle, obtuse triangle, triangular prism, trapezoid symmetrical, trapezoid asymmetrical, rhombus and diamond.