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LUX 5 x 5 Square Envelopes are perfect for invitations, announcements, greeting cards and special occasions, square envelopes create a unique look, sold as 500 per box. Please note: most square envelopes require additional postage. 5 x 5 Square - 80lb. paper is two grades heavier than standard envelope paper. These envelopes are manufactured by Envelopes.com and are sealable with Peel & Press?.