Olfa Non Slip Ruler. Non-Slip surface for stable and safe cutting. Frosted acrylic surface with black numbers for clarity on light and dark color fabrics. The ruler allows the user to make precise measurements and cutting angles during sewing and quilting applications. 16-1/2" x 16-1/2" Inch grid model. Accommodates both right- and left-handed users. Features Olfa Quilt Ruler. 16-1/2 inch x 16-1/2 inch.