Spruce up your mail with these beautiful usps 2016 pets edition stamps. These are forever stamps which means that they never go bad. They are always good for 1oz machinable envelope. And you are actually paying slightly less for these stamps if you were to buy regular stamps at the post office. you are paying 50 cents opposed to 66cents per stamp. A saving of three dollars and twenty two cents. Don't miss out on being able to mail with these beautiful stamps before it is too late. All our stamps are validated with short wave uv light to ensure authenticity. According to my knoledge if they are uv tagged they are authentic. Shipping to USA only.