June Tailor Quilter's Cut'n Press II
I have two of them - one has a gray cutting mat side with red printing on the pressing side and the other one has a blue cutting mat side with blue printing on the pressing side.
I use them a lot.
The "however" part - the measuring lines do not match the measuring lines on any of my rulers. So if one is trying to square up a block or unit to a particular size - do not rely on the lines of these things.
So - check with your ruler to verify/calibrate the measurements and go from there if one uses these mats for squaring up.