PRESALE! The Golden Rule(r) is a handy wallet-sized device, designed based on the golden rule. Measure and draft lengths, angles, and perfect circles with this versatile tool that fits right in your back pocket! Perfect for designers, architects, inventors, doodlers, and lovers of shiny things. (Imperial Measurements, 3.25" wide x 2" tall) Currently taking pre-orders with first shipments to be expected after November 1.