This is the perfect solution for preventing ruler slips, crooked cuts and wasted fabric. I've tried the dots before, but they weren't flush with the ruler, making it bow in between the dots. This lies flush with the ruler and is removable, though I'm not sure why you would want/need to remove it. The amount in the roll seems fairly generous to fit multiple rulers. I'm recommending this to my quilter friends, and would definitely purchase more.