The Ai Art Institutes VARY FORM CURVE RULE Sewing Ruler is a high-quality aluminum tool measuring 18 inches and 1/8 inch in thickness. Made in the United States, this ruler is perfect for crafting and sewing projects, especially for creating intricate French and hip curves. With the reputable brand of The Art Institutes, you can trust the precision and durability of this sewing ruler to help you achieve accurate and professional results in your sewing projects.