I have Invisi-Grip on some of my rulers and also have the sandpaper dots (cut in half) on others. Another thing when you are cutting a strip longer than 12", make sure to only cut when you have your other hand holding the ruler right next to where you are cutting. As you push past where your hand is holding the ruler, stop cutting, walk your fingers away from yourself to the next portion, continue cutting, stop cutting, move your fingers again, until you get all the way across.