I've always used regular rulers to line up blocks, but this is much easier. The lines are very thin, which is very important for accuracy, but they are easy to see with the naked eye. I didn't need to read the instructions as it is very easy to use. They are slippery so I added grips at the bottom. I bought the largest size and immediately ordered the other two. Nothing is easier than aligning/cutting blocks for a quilt.
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