Sew On A Roll-Half Square Triangles On A Roll. The paper grid is a pattern for sewing and cutting. It is printed on a roll of paper that enables you to make as many or as few triangles as you need with 2 different fabrics. Simply select your fabrics, place them together, place the paper on top of the fabric, pin the layers together, sew on the dotted lines and cut on the solid lines. You'll have half squares in a jiffy! Seam allowances are built in. Instructions are provided on the paper. This package contains 50 feet of 3-1/2 inch half square triangles. Made in USA.