This is a vinyl tape made for putting on your quilting rulers. You use it to highlight the measurement you are using. Removes easily when you are done with that project.
Thank you all for all the great ideas. @Lilian & @Ellabella I seen one of them ones on amazon and bought it.
It is only flimsy not one you would run a rotary cutter along. Purely for measuring and drawing circles and curves.
If you tape two standard pencils together they usually draw about 3/8 apart. Easier for curves than a rule too.