1. Material: acrylic 2. Size: 30cm in length and 15cm in width 3. Suitable for any dark and light-colored fabric, intimate design such as the angle of the left and right to the scale; 4. Specially designed to measure angles of 30 , 45 , 60 ; both left and right hands can be used; 5. 3mm thick acrylic material, 15 30 large size area, easy to fix the fabric when cutting. A special ruler for machine stitching, which is more convenient and fast when cutting machine stitching. It is a tool for patchwork lovers.