Descriptions:1. The quilting ruler is made of acrylic material, 0.1inch thick, hard and transparent, with a smooth surface, which can be used with rotary cutters and various cutting tools for professional fabrics.2. Patchwork sewing ruler in centimeters and degrees with clear numbers and precise scale display, easy to read, two-color design grid lines are clearly visible on light and dark fabrics.3. The clear acrylic ruler can be used as a tool for measuring, drawing, sewing and more, it can be used as a cutter ruler with a wheel knife, specially made for sewing and craft projects.4. Notice: Patchwork rulers are different from general clothing rulers. It usually needs to be used with round knives. It's thick enough that it won't hurt your hands easily. When cutting, the pressure on the fabric should be tight so that it is not easy to slip.