Strathmore 500 Series Writing pads, journals and envelopes are made from natural white, wove-finished paper made with 25% cotton. Each product in this series is made with heavyweight, high quality writing paper. This acid free paper is perfect for calligraphy, hand lettering and correspondence of all kinds. Writing pads are available in 6x8 and 8.5x11 and envelopes are available in #6 and #9 standard mailing sizes. Each writing pad has a mess-free flipover cover for easy paper removal. Pads and journals are available in both blank and non-photo blue lined versions.