* Min. Size: 105*90mm, size can be customized

* Window Size: Rectangular or circular，size can be customized

* Paper: 128gsm coated paper

* Window material:  OPS window film,Paper window film is available

* Brand image is visible through window 

* 50% lighter than white card packaging and cheaper shipping 

* Back buckle design, can be used repeatedly 

* Customizable print design on envelope for marketing message