Ruler Work Glider creates a slick sewing surface. Polyester mat with micro suction technology secures to Table and sewing machine. 12” x 20” removable polyester, round hole pre-cut for feed dogs Slick topside allows for easy fabric glide Micro-suction technology secures to sewing machine and/or extension table Can be trimmed down with scissors Clean with warm water and air dry to revive Ideal for Free Motion Quilting