PB Teen "Grinch" flannel twin extra long flat and fitted sheet set (no pillowcase).  Pre-owned condition with what appears very little wash wear.  This set looks like it wasn't used much - the flat sheet and perimeter of the fitted are bright and stiff.  The area on the fitted sheet that would be laid on has pilling and red fibers/dye transfer covering the white areas (please see pictures).  Going to assume this would be typical of red flannel.  All questions welcome.  Thank you for looking!