Mead Press-It Seal-It Envelopes: Press-it Seal-it, self-adhesive closure makes sealing the envelopes easy. Simply peel the strip, and the envelope instantly seals with no licking necessary. Available in two sizes: 3-5/8 in. x 6-1/2 in. and 4-1/4 in. x 9-1/2 in. Country of Origin: United States.