The Sewing Edge is as thick as three layers of regular cotton fabric. The Cutting Edge is as thick as two layers of fabric. The Sewing Edge is thicker so that when you are sewing, you can feel that you are up against it but not over it. The Cutting Edge is only two layers because if you have it a lot thicker and are cutting only one layer of fabric, the ruler will rock or move too easily. (I testedï»¿ several thickness of the strip before deciding on the optimum.)
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