Sew perfect 1/4" seams! The smooth surface reduces resistance and allows easy machine quilting. Save time with Sew Straight by sewing unmarked diagonal lines and Triangle Squares. There are countless ways to use Sew Straight. Accurately sew bias seams for Binding in a jiffy. Quickly check patch size with reference lines. Self-Adhesive Backing that can be removed and re-positioned over and over. This is not a cutting mat. Made of: Plastic Use: Sewing Aid Size: 13in x 18in ⚠️ WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov. Enjoy free shipping on all orders over $60 (before taxes and after discounts) when you use the code SHIPSFREE at checkout. No need to worry about shipping costs--just add your favorite items to your cart, apply the code, and the shipping is on us!