Product Description Beautiful 25% cotton writing paper in pads and envelopes are perfect for calligraphers, hand lettering, and artful correspondence. Available in 2 pad sizes, the natural white, wove finish paper is acid free and is available in both blank and non-photo blue lined options. Pads feature a flipover cover that allows sheets to remove cleanly from. Perfect for a broad range of ink varieties and writing instruments Acid free. Available in 2 standard mailing sizes, #6 envelopes and #9 envelopes are the perfect complement to Strathmore Writing pads. Acid free.