Quality Park White Leather Tyvek Envelopes are ideal for shipping and organization at an office, school or home. They are made from regular-weight Tyvek for strength and feature an embossed, leather-like texture that stands out from standard mail. These plain white catalog envelopes also have convenient release strips for easy opening and self-sealing Flap-Stik closures. The box contains 100 envelopes that each measure 9" x 12" in size.