#56 Mini Window Envelope (3 x 4 1/2) - White (50 Qty.) | Perfect for the Holidays, Gift Cards, Product Information, Directions, and more! |EN5603-50 Size: #56 Mini Window Envelope 3 in x 4 1/2 in / 3 x 4.5 Mini envelope is quite the wee workhorse with a variety of uses from gifts to flowers to tipping, and more.