Non-slip with black markings. Easy to read numbers and gridlines. 1in grid with 1/2in, 1/4in, and 1/8in increments. The OLFA model is the go-to ruler for quilters and crafters. It's great for fashioning scrapbook and album pages, making templates for pillow tops and for simple square patchwork designs. You'll find it's also ideal for squaring pieced blocks and cutting larger pieces.