Porcelain tiles modeled after grid paper

Paper is a collection of porcelain tiles from Ornamenta that, due to a special glaze, act like a chalkboard and elevates tile by giving it a utilitarian function meant to inspire creativity.
With a design modeled after grid paper, the collection is available in three colors: gray, white and black.
Features include a static coefficient of friction that is 0.55 when dry and 0.60 when wet.
Tiles are rated to DIN 51130, DIN 51097 and ASTM C1028.