Made with 1/4in acrylic. Angela Walters, machine quilting author and teacher, designed Slim with you in mind! Features- Creative Grids® grip prevents slipping Black and White dashed guide lines are visible on all fabric colors Curved edges create versatile designs The narrow width fits in any size throat space The perfect length - long enough to quilt lines in any direction Use it for: stitching in the ditch; echoing crosshatching; stitching parallel lines; geometric patterns; border designs and more! It is 1/4 inch thick so it works for domestic as well as longarm machines. View a video demonstration. Total Size - 2in x 7in