InterestPrint William Morris Zippered Pillow Cases 18x18 inch(Two Sides) 50% cotton, 50% polyester Standard size that help extend the life of your pillows. The pillow case has an opening zippered on the side. Size:18x18 inches(The Front side is the same to the back side) With pre-shrunk fabric, this pillowcase is washable at 60 degrees Celsius.