Usefull card

thingiverse

The card has a protractor and marks with 30,60, 90, and 135 (can be used as a 45 angle) degrees. It also can be used as a compass, with 0,5 mm difference between the small holes. It has a ruler (in centimeters) There is an earphone holder (you need to wrap the earphone around the trapezoids and lock it in place by inserting it in the middle trapezoid ). The card has 1 mm of thickness and smaller rectangles to be easily pulled out from the wallet P.s. the trapezoid in the middle have 30-60-120-150 angles