This quilt ruler is made of acrylic materials and designed for quilting, sewing, measuring, drawing, and crafts. The ruler is transparent. Whether it is light colored or dark colored, it can provide you with a good view. Please align the center line of the ruler with the center line of the map, increase it to the left and right, find the size you need to set, cut off the surplus cloth on both sides of the map along the , and then rotate the map 90 degrees, and then follow the above method. Cut off the excess cloth. (It can also be used to correct dimensions and make maps). The rotary cutter enters from the teardrop like incision, pushes it toward the , or pulls it back to cut the cloth. When the length of the cloth from top to bottom exceeds 12.5 inches, please fold the cloth. The folding line must be placed perpendicular to the cutting to that the cloth cut during folding is straight. Colour:Transparent Material:Acrylic Size:12 Inch Package Contents: 1 * Quilt Cutting Ruler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.