Metallic silver invitation envelopes: These #10 envelopes feature a elegant silver color; the #10 mailing square flap windowless envelopes are perfect for your office or home purposes High quality: Made of 110 gsm superior paper with outstanding durability and sealing and it won't easily tear in transit Convenience to use: Wipe a little water to wet the sealing area of envelope, fold sealant and hold it for a minute. More environmentally friendly than Self-seal envelopes Multi-use occasion: These envelopes are perfect for mailing birthday cards or greeting cards, birthday party, baby shower, fundraiser or weddings invitations, letters, save the date cards & photos, personal mail and direct mail Standard Size: The #10 mailing envelope measure 4.125 x 9.5 inches, providing enough space for your mail and invitations use Keketer #10 envelopes are the perfect solution for your invitation or mailing needs!