Brand new in packages Black / king size 20”X36” Pillowcases are 16-momme, 100% pure, natural silk pillowcases designed with a hidden zipper for hair and skin beauty benefits. They feature a smooth, breathable, and cooling surface meant to reduce frizz, hair breakage, and sleep lines. They are machine washable and popular as a gift.Key Features and BenefitsMaterial: 100% pure, long-strand mulberry silk.Weight: 16 momme, which offers a soft feel and durable, machine-washable quality. Closure: Hidden, high-quality zipper ensures the pillow stays securely inside. Beauty Benefits: Hypoallergenic, breathable, and reduces friction to prevent skin wrinkles and hair tangles