Gossamer Designs LLC Sew Slip II with Feed Dog Hole for Free Motion Stitching SEWSLIP-2 A 12in x 18in sheet with a slippery top surface & a tacky bottom surface to hold it in place. It has a 1in x 1 1/2in rectangular hole allows all types of sewing to utilize the slick top surface as the feed dogs are available for guiding fabric. This allows sewing with difficult fabrics such as leather and pleather, minkee, flannel and fleece. No adhesive to clean up. Washable & can be cut.