Custom designed for usability after extensive study of what customers want | Reversible - Green side in INCHES -- black side in CENTIMETERS - .01 mm tolerance for accuracy! | Tabs for standard sizes for paper and photographs - common drawing and cutting angles included | Tired of tracking to the edge of the mat for the inch? We've solved it by including size markings up and across the mat! Never scan to the edge again. | Measurement lines stretch beyond where normal mats go, when your media covers the markings, you can still see them!