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. A smaller portion of the mat is divided into 1/2 x 1/2 inch increment and there are two lines, vertical and horizontal, with 1/8 inch hash marks that intersect at the center of the mat. The reverse side is solid Green. For use only with rotary blades - fixed-blade knives blade may damage mat. 24 1/2 x 36 1/2 x 1/16 inch.