Quality Park 5x7 1/2 clasp envelopes are a staple of every office; a gummed flap & reusable clasp make them ideal for mailing and storage; 100/box Envelopes have durable 2 prong metal clasps and reinforced eyelets to let you access your files as needed; open, close, repeat A deeply gummed envelope flap is laid thick with moisture-activated adhesive; creates a firm seal you can trust in the mail Heavyweight 28 lb kraft paper envelopes are opaque to protect private contents; strong enough for bulk mailing or organizing the office Stock up on our versatile 6 x 9 size; perfect for mailing transcripts, administrative records, business mail or 6 x 8 greeting cards Clasp envelope on paper stock features a gummed flap closure Double prong metal clasps with reinforced eyelets Heavily gummed flaps Reusable Envelopes