Heavy-duty High Quality Aviation aluminum, Compared with normal aluminum alloy, aviation aluminum is lighter, more flexible, and less prone to deformation. It can immediately spring back to a flat state even being bent big degrees. Accurate scale, the measuring scope is from 1 to 18 inches. Two sides printed. Professional vary form curve ruler is a must have tool for sewing. 1/8" calibrations on one edge and two sides. Smooth Edge and sleek curve help you achieve perfect curve cutting. Perfect tool for pattern making, tailors, students, fashion designers and other DIY lovers, adding fun to your life., Manufacturer: KEARING