Olfa Cutting Mats protect your cutting surfaces and help to preserve the cutting edge of rotary blades. This double-sided mat has 1 x 1 inch Yellow grid lines on a Green background with 1/8 inch Yellow hash marks along the edge and Yellow lines that cross the grid at 30, 45 and 60 degree angles. The reverse side is solid Green. For use only with rotary blades - fixed-blade knives blade may damage mat. 18 1/2 x 24 1/2 x 1/16 inch.