Size 16.5" x 22". The original pure Teflon® top slides with zero friction and now has a new self sticking underside. The Supreme Free Motion Slider "clings" and is easy to remove. Just three easy steps to successful machine quilting! Attach the free-motion foot. Lower the feed dogs. Position the Supreme Slider on sewing bed with the needle centered in the pre-punched hole. Fits any machine and can be trimmed with scissors. Includes free quilting designs.