About this itemSilk and CottonImportedUpper side: Grade 6A, 100% pure, organic and long fiber mulberry silk. 25 momme, 900 thread counts. OEKO-TEX Certified (Standard 100). Queen: 20X30inch(51x76cm), King: 20X36inch(51x91cm)Underside: 100% high-quality cotton. The cotton underside is designed to prevent the pillow from slipping off the bed. Zipper closure is to prevent the pillow from slipping off the pillowcase (with select high quality plastic zipper to avoid any damage which may caused by metal).Mulberry silk is smooth, soft, breathable, cool-to-the-touch, and hypoallergenic. Great for preventing facial and neck wrinkles, dry skin, tangled hair, and bed head.Thick stitches: 13 stitches in 1inch. All pillowcases are handmade carefully and show fine workmanship. No tearing or breaking seams even after repeated washing.Package: solid PU bag package.