A technical patent diagram for a golf club is rendered in white line art against a charcoal black chalkboard background, showing detailed cross-sections and measurements across five labeled figures. The composition balances scientific precision with the worn, authentic texture of vintage patent documentation, evoking early-twentieth-century industrial illustration. Printed on smooth white card stock and made to order, artwork on the front, blank inside, envelopes included in every set. A handwritten note that arrives as an independent artist's work.