Now be precise in measurement of circles and curves with this flexible Ruler which can be adjusted to hold their shape. With a raised edge lets you draw a line. This ruler is made of plastic and calibrated in 1/16" measurements on one side and 1mm increments on the other side. Comes in 3 sizes, 12"lg, 24"lg and 36"lg. Or in a kit which includes all 3 sizes. 1LBS.