This pillowcase is woven from 70% Mulberry Silk (32 Momme) + 30% cotton, making it more durable and not easy to wrinkle when compared with pillow cases made by 100% pure silk. Standard Size: 20 inch x 20 inch / King Size: 20 inch x 26 inch. It's a perfect choice for year-round comfort and coziness. The simple style makes the pillowcase match all bedroom décor. Exquisite workmanship and meticulous sewing avoid loose stitching. Hidden zipper closure makes the pillowcase even more luxurious. Because it contains silk, it is recommended to wash by hand first, hang to dry, and cannot be machine washed. Only use low-temperature ironing.