I received these king sized sheets very fast.  I opened the package to wash them first and noticed a black streak (about 4 inches long) on one of the pillow cases.  I thought it might be ink because it did not come out after the first wash.  I really love  how these knit sheets look and fit and I will attempt to remove the black streak after I've investigated the stain further.  I have decided to keep the product and will live with the stain since it's on a pillow case and can be hidden, but I am giving this product only four stars because of the stain.