Sufficient to Use -- You will receive 30 pieces of gift card sleeves in a rich quantity and elegant colors to meet your daily needs and party use; You can also share them with family and friends to use. Window Envelopes -- These envelopes contain an oversized transparent window centered on the face that is ideal for mailing letters, postcard, catalogs, invoices and invitation card. Simply position the card you want showing on the top so the window can frame and display the entire contents. Easy to Use -- The gift card sleeve has a fold in flap closure that is easy to open and close; It can be closed without glue, so the envelope will not be broken when opened, bringing you a good use experience. Proper Size -- The card envelopes are designed with windows, the envelope measures approximately 3.9x6", the window measures approximately 3.93x2.36", making them easy to carry and lightweight, you can carry them in your backpack or pocket without taking up too much of your storage space. Where to Apply -- the card envelopes are suitable for storing gift cards, credit cards, postcards, banknotes, coins, business cards and wedding invitations, and they can also be utilized in hotels, restaurants, small corporate annual meetings and parties, which can bring convenience to your life.