We are proud to offer the most flexibilty in the industry by giving our clients the ability to write on a variety paper sizes 3x5, 4x6, 5x7, 6x9 or 8.5x11 cardstock or A1, A2, A6, A7, A8, A9, & A10 envelope sizes. By default we use 4x6 stationary & A6 envelopes. To place a custom order please reach out to us at support@simplynoted.com.