The 4" X 6" Postcards are a perfect product to reach out and market to your local communities. This size is the most common style postcards and they are used for night club flyers, real estate promotions, and for business marketing campaigns. The standard cardstock for postcards is the 16 point UV gloss or premium matte. A really nice postcard for general handouts. Get it glossy on both sides or on the front only if you want to write on the back. We also offer the premium cardstocks, give us an email or call for other stock paper options.