Originally Posted by MNQuilter

My guess would be that they are cut with pinking shears type dies so that there is not the unraveling that you would get from a straight cut. Withthe pinking cut, you only get the little triangles coming apart and still keep the majority of the fabric, as there is no way that all of those little triangles are coming apart enough to cause the actual square to come apart. I know that is why pinking shears are used on clothing.