A1 Envelope Kraft Invitation (4 bar) Size 100 Pcs, 3-5/8 X 5-1/8 Inches by Secret Life, Prefect for Gift Card, Thank you Card The pack come with 100 pieces of Kraft natural A1 envelopes, each set are carefully packed for you to receive perfect condition product. The envelopes are exactly measured 3-5/8 by 5-1/8inches, which make them official A1 (4 bar) size, All Envelopes are executive style diagonal Seam V-Flap construction The Seal is designed to be moisture activated gummed seal, a little moisture goes a long way, convenience self sealing. These classic style Euro Flap Envelopes are made with natural Brown recycled fibers, they have contour flap that give each envelope a sleeker and more elegance look. Prefect for party, thank you cards, wedding, announcement, it's always good to have some of these on hand. These envelopes are made with 100 LBS (150 GSM) Premium card Kraft card stocks, not flimsy at all.