Strathmore 105-970 300 Series Bristol Artist Tiles, Vellum 4"x4", 20 Sheets These Artist Tiles by Strathmore were specifically developed to be used for the popular creative meditative drawing exercise popular now Made out of Strathmore's 300 Series Bristol Vellum; the 4"X4" tile is format appropriate for pattern drawing and creating inspiring art with dry media Pad contains 20 tiles of 100lb; acid free; vellum surface paper Made in the USA