The classic Zentangles are made on 3 1/2" x 3 1/2" paper tiles. They were originated by Maria Thomas and Rick Roberts the founders of the Zentangle movement. They prefer using an Italian made paper, Tiepolo by Fabriano. The paper has a velvety woven surface, not completly smooth, but with some noticable weave. It is also acid-free. You can purchase tiles through their web site at www.Zentangle.com or make your own of any paper of your choice.