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Why choose us? The curve ruler is flexible and adjustable, providing accurate measurement of curve edge. The mark on the tape measure is large enough for your reading. The interesting Curve Ruler design can add fun to your design. It is an ideal choice for measuring curve seams and designing curved edge patterns. Specifications: Material: plastic Color: White / blue Size: 24 Inch long Instructions for use: when drawing a curve, first determine a sufficient number of points on the curve, then twist the ruler to connect with the points at different positions, finally draw the curve smoothly along the ruler with a pen. Note: This ruler is not suitable for copying curves from one side to the other. The 1/16 inch measurement value is calibrated on one side and calibrated in 1mm increments on the other side. If you have any questions, please contact us immediately and we will reply within 24 hours.