‘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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Hannah Davis
Techno-Designers
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5 comments
sir,
I need to buy constrained ball ruler attachment where and how to buy please tell me
is the constrained ball ruler just a prototype or is it available for purchase
Dear sir,
I like this very much and I tried to buy online but I couldn’t get where can I buy the constrained ball.
Thanks
hello, i am a stationary trader in India.
i want this product under my Brand name. pls rply soon
Where can I buy in Italy Giha Woo’s drawing perfect curves with ellipser and Constrained Ball, pleas?
Thanks so much
Paola Schiavi