Made of durable acrylic, this quilt ruler is designed for quilting, sewing, measuring, drawing, and crafting. Rulers are transparent. Whether it is light or dark, it can provide you with good vision. Please align the of the ruler with the of the map, increase left and right, find the size you need to set, cut off the excess cloth on both sides of the map along the space, then rotate the map 90 degrees, and follow the above . Cut off excess fabric. (It can also be used to correct dimensions and make maps). The cutter enters through the teardrop-shaped cut, pushing it toward the slit, or pulling it back to cut through the fabric. Fold the fabric when it is than 12.5 inches from top to bottom. The fold line must be placed perpendicular to the cut seam to that the cut fabric is straight when folded. Colour:transparent Material:Acrylic Size: 20.5 x 20.3 x 0.3cm Package Contents: 1 x Square 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.