Nyan Cat Fly Pillowcases 20x30 Inch This custom standard pillowcase is roomy in size (20x30) and has been designed to add sophistication and style to your bedroom. The custom pillow case is without buttons, and has an opening on the side. With pre-shrunk fabric, this pillowcase is washable at 60. 50% cotton, 50% polyester. Having this soft custom pillowcase will add both comfort and style to your home.