Fabric: Made of 22 or 25 momme 100% mulberry silk charmeuse fabric on both sides, which is more than 15%-30% thicker than 19 momme silk and is more durable. Sizes: StandardQueen 21 x 30, King 21 x 38 Styles: Envelope closure opening is 5 from one end of the pillowcase, with 5 overlap. Zippered closure is neatly closed by a hidden mini zipper. Silk pillowcases are recommended by dermatologists for the prevention of wrinkles and dry skin. They are breathable, cool and smooth against your skin, and naturally hypoallergenic. They can also prevent dryfrizzled hair, minimize hair breakage and promote healthier hair. eBay hassle-free returns within 30 days of receiving the item, seller pays return shipping, and no restocking charge. Following this link for a burning test https:youtu.beCPh-zFulW-8. Powered by eBay Turbo Lister The free listing tool. List your items fast and easy and manage your active items.