This marker is a collaboration between OTR and the artist Shoe. Shoe is the artist behind the book Calligraffiti and the movement combining graffiti with the stylization of calligraphy lettering. This marker features a custom nib designed by Shoe. It's a T-Nib with a sharp angle cut into it, allowing you to make various line thicknesses ranging from really wide to ultra thin. The marker comes filled with OTR's .060 alcohol based paint. It also features the Calligraffiti logo on the side on the marker, making it somewhat of a collectors item.