I agree with Peaceandjoy. I also hate them. My LQS did a very popular Saturday Sampler and required that we use them. I'm sure it was so that they could use 2 1/2" strips for the HST instead of 2 7/8" strips. It doesn't sound like much but with the size of the quilt and the number of people participating I'm sure this saved them a ton of money. Unfortunately it caused me a lot of headaches. Since then I have discovered the EZ Angle ruler. It is so much easier with no paper to rip off when done.