Quality Park 12x15 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 32 lb kraft paper envelopes are opaque to protect private contents; strong enough for bulk mailing or organizing the office A great value; you never know when you’ll need these jumbo catalog envelopes for oversized storage