These peel-and-stick silicone discs are fabulous for gripping your fabric and keeping a ruler in place as you quilt or cut fabric. They are clear and won't obliterate markings, nor keep you from seeing fabric or lines of stitching under them. Package contains 15 large doughnut shaped discs. The small center 'holes' can be used as well as the entire sheet of material that the discs are cut from. These are Amy's favorite product for reducing sliding of rulers.