Stamps.com 2-Part Window Envelope Labels are specially designed to work with pre-addressed or windowed envelopes. Print postage and return addresses in one easy step. Requires Stamps.com version 7.5 or higher.

• Convenient: With 16 label sets per sheet, it's much easier than feeding envelopes.
• Flexible: Can be used for any domestic mail class and on all mailpiece types including postcards, letters, flats, and packages.
• Easy to use: 8½" x 11" sheets are easy to feed into your inkjet or laser printer.
• Save Time: With these labels you just print, peel, and apply!