Olfa's popular 17" x 17" green exclusive rotating self-healing professional quality rotary mats rotate 360° smoothly, eliminating the need to move your body or your project around. It's simple to use, just cut, rotate mat, and cut again! Non-slip back for stable and safe cutting and light-weight to take along to class. Easily make 30°, 45°, 60° and 90° cuts. Especially designed for use with OLFA® rotary cutters. Rotary mats protect your work area and greatly extend the life of your rotary blades.