2 Luxurious 100% Silk Pillowcases Standard Size BLACK. 100% Mulberry Silk, 19 momme. The silk fabric is anti-dust mite, anti-bacterial and anti- pilling. Pillowcase is 20 inches x 26 inches. Pillowcase comes in sealed plastic bag. 100% Silk pillowcase does not tug hair (like cotton) while sleeping, leaving hair with less breakage during the night. Pillowcase does not cause friction on the hair either, allowing for slip and less creasing of the face while sleeping. This silk does wonders for your hair, skin and overall health while you sleep!