Honestly, I hate Invisi-Grip. It has a some kind of shiney-flat sheen the reflects light or something and makes it harder to see the lines on my old (orange lines; can't remember the brand) ruler. It still slips, too. I'm ready to remove it and use sandpaper dots. On one of my (orange lines) ruler, I have plastic dots and it grabs the fabric so tightly I can't slide it, which knocks the fold off kilter. I'm ready for new rulers, I know, but I hate to spend the $$.