1.FABRIC: The silk pillowcase is made with Grade A long silk fabric on both sides in 19 Momme 400 thread count.2.NOTE: Hand washZipper closure at the side avoids slipping,Size of silk pillowcases: 20 inches x 36 inches, usually fits king size pillows, you can measure your pillow size before you make the order3.Benefits: Breathable, Comfortable, Healthy, Chemical-free, Anti-aging, Less Absorbent, Reducing facial wrinkles and avoiding dry/ knotted hair when you use it with long termCare Instructions: Silk is a protein structure much like human hair.4.Suggest hand wash separately in cold water. Use a mild or specially formulated silk shampoos. Hang it on hanger and dry place away from direct sunlight. Try to iron the pillowcase on the backside when slightly damp and use a cool setting.5.Best product for Mother's Day, Wedding Party, Anniversary Day, New Year, Spring, Summer, Autumn, Winter