Envelopes are an essential stationery item for any correspondence whether it be for business letters, personal letters, leaflets, brochures, gift cards or vouchers. There are various kinds of envelopes available which include self sealing, gummed (with a strip of glue to moisten on the flap), padded or reinforced; fabricated from paper, board or plastic. Business envelopes can contain a window covered by a clear material, which allows the inside contents to be seen; usually used for addressing the letters inside without the need of duplicating the details on the envelope. In addition we can also supply security envelopes with a pattern printed on the inside, which prevents the contents being seen through the envelope.