Printing in progress. These pieces are being made on linen, a flax-based textile on which Wikipedia has some fascinating insights:
Linen fabric is one of the preferred traditional supports for oil painting. In the United States cotton is popularly used instead as linen is many times more expensive there, restricting its use to professional painters. In Europe however, linen is usually the only fabric support available in art shops; in the UK both are freely available with cotton being cheaper. Linen is preferred to cotton for its strength, durability and archival integrity.