C5 size Pacific Blue mailing envelopes to fit A5 papers/card or A4 size paper folded in half. These envelopes are made from high quality 120gsm paper to give a fantastic impression to your customers (and potential customers). These are gummed mailing envelopes, designed for large scale mailings. Featuring an address window and in this striking blue colour, they are a popular choice for Direct Mail. The Pacific Blue colour shade is also known as Cocktail Blue.