DiyCaseStore Marilyn Monroe Smoking Custom Pillowcases Covers Standard Size 18x18 (Twin sides) Standard pillowcase is roomy in size (18"x18") (Two sides). Made of 50% cotton, 50% polyester Does not include the pillow core.Form-fitting design Makes a great quality gift for someone who has everything The perfect complement to your couch, custom pillows will make you the envy of the neighborhood.