The size of these envelopes makes them ideal for receipts, invoices, cash, checks, folded documents, announcements, tickets, boarding passes, sales slips, and more! Each of these envelopes features a secure gum closure to keep items safely in place as they travel through the mail. Use these versatile envelopes for multiple home and office mailing needs! Details:Brown kraft4.75" x 11" (#12)28 lb.50 envelopes100% recycled paper