Geekery Nerd Maths Science Square Cotton Linen Sofa Cushion Covers Decorative Pillow Cases 18 X 18 Inch Zippered Throw Cover (Chemistry1) Made of Durable cotton blend linen Pillowcases , slightly rough texture, light weight . Soft, breathable environmental protection Size: 18 x 18 inches / 45 cm x 45 cm Square Cushion Covers , 6.35OZ / 180g Geekery Science's pattern is just on one side, the back is without printing. Safe to machine wash, Cushion cover has an invisible zipper,Hidden slide fastener design for good looking! Package: 1 x pillow cover, Insert are not included