Sasafras, to keep your rulers from slipping when cutting I went to WalMart and bought a pack of Felt Pads, in the hardware dept. there is 84 little round dots, to a pack. after sticking these to each corner, I wait a day or two them remove them, they leave a film that will keep your ruler from slipping when rotary cutting. Cheaper, I think then buying this from JoAnn's.