Polyester FiberSize: 4 PCs square pillow covers.18×18 inch / 45×45 cm.Material Composition: 100% polyester fiber. Material is processed to protect against any shrinkage after washing. More durable than cotton.Printing on one side. No Filler/Insert. Pillow case have sturdy invisible zipper. Zipper glides smoothly and allows easy insertion and removal of pillow inserts.A Perfect gift for her and him.Hand wash or dry cleanable.