Custom The Little Mermaid Pillowcase Standard 20x30 (one side) Pillow Cover PLC-260 Custom Picture Pillow Cases 20" X 30" (one side). Made of 50% cotton, 50% polyester. The custom pillow case is without buttons,and has an opening on the side Having this soft custom pillowcase will add both comfort and style to your home. Nice hand feel due to top material with high quality.