Made of thin and pliable, yet durable plastic material. Their tuck flap closures are comprised of a rectangular tab that tucks in to a slot in the front of the envelope. They are perfect for all kinds of letter-size documents that you want to keep safe from tearing, crumpling, bending, stains and other damage. Use them at school, the office or at home. Details:In an assortment of colors9.875" x 11.75" each6 envelopesPlastic