See where your creativity takes you with these unique Creative Design Rulers! Unlike normal rulers, these design rulers allow you to create perfectly amazing patterns and designs! In addition to the two large circles used to invent one-of-a-kind shapes, the ruler internally holds outlines for other shapes including a square, a pentagon, diamond, arrows, and more. This ruler also internally holds 3 different sized pieces with holes to hold your writing tool in place. Just pop them right out and when ready to design, and place them back in when finished! Use different colors when drawing different lines for a more colorful kaleidoscopic piece! Design away! - Product is approximately 8 inches (210 mm) long and 4 inches (100 mm) wide.