Blue Butterfly Water Reflection Square Decorative Throw Pillow Case 18x18 Inch Custom Personalized Zippered Soft Cushion Case Cover for Sofa(Twin sides) 50% cotton/50% polyester Imported Material:50% cotton, 50% polyester. Size:18 x 18 inches/45 cm x 45 cm Pillow insert are not included. Hidden zipper design.Safe to machine wash. With pre-shrunk fabric,this pillowcase is washable at 60 degrees Celsius.