About This OUR PILLOWCASE SET HAS RECEIVED THE GOOD HOUSEKEEPING SEAL - Luxury 2 King Pillowcases (21"W x 40"L): Simple open-end design (4u201D hem) with slip-on convenience - no zippers or flaps. These pillow cases king size pair well with our 600 thread count sheet sets for a polished, cohesive look. Independently tested