JAM Paper A10 Recycled Invitation Envelopes are ideal for mailing invitations, announcements, business materials, letters, cards and much more! They have a thick and sturdy build because they're crafted from high quality 24lb paper. And while these booklet-style envelopes offer protection and security, they also help preserve the environment since they're made from 50% post-consumer content.Details:Available in assorted colorsA10 size (6" x 9.5")24 lb. paper25 envelopesBooklet opening50% post-consumer content