Looks like 1/2 snowball blocks where only 2 corners have a sew & flip triangle. If you look closely, you can see that the triangle are different sizes. One looks to be about half the size of the patch, the other is smaller. Assume that each of the 4 blocks that make up the butterfly wing finish at 4". I'd make one triangle finish at 2" and one finishes at 1.5", with the body strip 1".