‘Constrained Ball’ is a drawing aid created by a Korean product designer. Once attached to the pen, this device helps to draw straight lines without using a ruler. Normally, a ball point pen rolls freely in accordance with the ball located at the tip of the pen. However, this writing tool prevents winding lines by helping to move the ball in one direction only. Using the installed measuring wheel indicated on the product, users can draw the exact desired line length in both a horizontal and vertical direction, as well as strokes in 45 degree angles.

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About Metric Rulers

How to Make a Ruler

5 Great Tables for Drawing

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