Standard New Arrival Pillowcase Dark Energy Neils Nuetron Relativity Throw Pillow 18 X 18 Square Cotton Linen Pillowcase Cover Cushion Dimensions: 18" x 18", standard size for your pillow. Burlap Cotton Linen Material, healthy and durable. Hidden Zipper at one side, available for the pillow fillin. Image print only on front, the other side is without any print. Not include the insert, just the pillow cover. Machine washable.