Large Envelopes 9x12: Yellow envelopes come in a set of 100 with sturdy box and professional look catalog envelopes can be easily addressed or labeled, self-sealing design saves time for household, office, business and legal mailing. Made from 80 Gsm thick paper with excellent tear, rip and puncture resistance cannot see through to protect privacy. Multi-purpose for mailing or organizing documents, letters, manuscripts, photographs, invitation cards, brochures, magazines and booklets. Self seal with strong adhesive, made paper, easy to peel and seal, no licking required. Packaged in sturdy boxes to prevent damage in transit suitable for bulk mailing, office filing and organization. Weight: 3.08 pounds.