DaedIt’s not meant to be an accurate measuring tool. It’s a fashion accessory that can give a an approximate mmeasurement . I wear mine everyday and have used it many times. It will stretch as all leather stretches. but is not overly problematic.
DaedI'm not sure, but the one I received was thicker than belt leather and it's never going to soften up. And the stamping on it is so blurred and indistinct you can't tell it's supposed to resemble a ruler (like the second example shown in this drop). So disappointed I've been loathe to join another drop.