‘constrained ball’
‘constrained ball’ is a drawing aid created by korean product designer giha woo. 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.
the mounting area is made with a flexible rubber material helping it adhere to the attached pen.
measurement of line is indicated on the product
GIHA WOO (6)
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more commentsHow do I buy this??
I think this is a great tool as I do art work and sign writing and sometimes rulers slip or get in the way. I know I would use it quite often
This is actually a really good idea – I know that sometimes when I’m inking a straight line with a ruler, the ruler will smudge the lines and I’ll have to redo the page all over again. so in these kinds of circumstances having an aid to draw a straight line that won’t impact the line itself would be fantastic!
Hi. could you please let me know how can i get the constrained ball
Thank you
Is this item commercially available for purchase?
oh my god i need one of this!
So i have to change my grip to use it?
Idea has potential.
go straight?
if really… perfect!
love it!
want one!
very great idea !!!!!!