Protect your cutting surface and blades with OLFA Rotary Mats. OLFA Rotary Mats are self-healing, professional quality mats designed especially for use with OLFA Rotary Cutters. Always store OLFA Rotary Mats on a flat surface, keep out of direct sunlight, and avoid extreme temperature change. NEVER ROLL YOUR MAT. OLFA Rotary Mats are double sided with green base color and yellow grid lines on one side and solid green on the opposite side for general use. The mats are 1.5mm thick with grid lines (in inches) clearly marked for easy measurement identification.