Non-slip with black markings. Unique pivot point; angle markings to easily make 15-30-45-60-90 degree cuts. Easy to read numbers and gridlines. 1in grid with 1/2in, 1/4in, and 1/8in increments Scrapbookers and quilters alike will love this square ruler. The OLFA ruler has patented compass pivot-point angle markings. And its frosted surface is more than just attractive; it's non-slip to eliminate frustration and promote safe cutting. (QR-6X12, #1071819) Good For: precise measurements and cutting angles for sewing and quilting.