TDL Ruha Harline is a modern and mechanical serif typeface and is the result of stencil’s RUHA development. Being the first typeface of the family, it sets the basic concepts for further development, on each version to come. The design approach, results from a rigid geometrical connection with the Roman du Roi, since the letterforms are imposed by the constraints of the RUHA ruler. The main typographic proportions are connected with the modern typefaces, like Didot or Bodoni. Maintaining the same structure with different typographical and stylistic properties, the stencil allows to explore a modern typeface, with vertical stress, high contrast between the thick and thin strokes and hairline serifs.