Ampersand Museum Series Claybord combines the durability of a true artists hardboard with ultra-smooth kaolin clay ground formula similar to that used during the Renaissance. Highly absorbent, and accepts more mediums than any other surface. Excellent for India, pigmented, and alcohol inks. Also great for acrylics, collage, pencil/pen, airbrush, watercolor, gouache, mixed media, and image transfers. Made in the USA. Available in multiple sizes and depths. 4 x 4 x 1/8 thickness, Pack of 4.