Get the JAM Paper 4.375" x 5.75" Metallic Invitation Envelopes, 25ct. at Michaels.com. Send invitations, greetings, thank you cards, and so much more with the confidence that your content is safe and stylish. This pack contains envelopes that are made from 32 lb. paper, have a shiny metallic finish, booklet opening, straight flap, and gum closure.