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I'm in Hong Kong,I would like to send the mail to The Vampire Diaries Cast .
1) I want to know what size of envelope should I send ?
2) Do I need to include the photos or just ask them to send me back the autographs ?

Please help !! Thanks a lot

Send a large yellow envelope with another folded up inside it with your address and maybe a few stamps on it. The post office will help you with this. I would send either a large index card or a pic in the envelope, just to be safe. Ask for a photo in the letter, if they have one.