Peacock Feather Pillowcase-Comfortable Custom Rectangle Pillowcase 20x30 (one side) Material:50% cotton, 50% polyester. It is one side printing pillowcase which do not contain pillow core. The custom pillow case has an opening on the side. With pre-shrunk fabric, this pillowcase is washable at 60. This soft custom pillowcase will add both comfort and style to your home.