I have used a lot of different rulers. I have about all sizes of Quilters Select and I do not think that I will ever buy another Quilters Select ruler again. I was having trouble with my cuts being a little off. I took my husbands wood square and put it on the side of my Quilter Select rulers and none of them were square. The way I cut, the middle of the ruler was, it had a bow in it on all of my long Quilters Select rulers. I had 2- 8 1/2 by 24, 1-6 by 24. 2 6 1/2 by 24 or 24 1/2 and they all had a bow in the middle of both sides. I think the plastic is softer and it slowly scrapes off when the rotary cutter passes by on it. I am now using Creative Grid rulers with Grippy sprayed on them and am having not problem. I am very upset with the price that I gave for my Quilters Select rulers.