JAM Paper White Booklet 4Bar A1 Envelopes come in various styles! These envelopes are stylistically diverse within our group of white 4Bar envelopes. These smaller sized white envelopes are perfect for appropriately shaped greeting cards, letters, an d invitations. These envelopes are 4Bar A1 size, measure 3.625 x 5.125 inches, are White, have a V-Flap gummed closure. Also available in many other styles and colors. ...