500 No. 9 Self Seal Security Envelopes – Peel and Seal Designed for Secure Mailing - Security Tinted with Printer Friendly Design - Number 9 Size 3 7/8 Inch X 8 7/8 - Pack of 500

Needed for use as a return envelope. Worked well in my printer. No jams. Worked as intended with very good sealing.

I include #9 envelopes as a return envelope so I don't have to fold them like a #10. This size is not as easy to find, and the price of these was great!

I like the self seal aspect. Use them for letter writing

Product was stuck to open very difficult like maybe a product flaw

There’s a perfect size to go in your other envelopes and help us receive our bills back in the mail. Easy to use.

Great to finally find #9 self seal security envelopes, had not found them in supply stores. We enclose them in invoices and other mailings for a small business.

They seal great but if you screw up or leave something out, you got about 5 min to pull open envelope without ruining it. After that, you need a new one;)

Great for the price