An event which was to particularly define the course of the rest of Garamond's career came starting on 6 September 1530, when the printer Robert Estienne began to introduce a set of three roman types adapting the single roman type used in "De Aetna" to a range of sizes. These typefaces, with their "light colour and precise cut" were extremely influential and other Parisian printers immmediately introduced copies. The largest size "Gros-canon" (42.5pt) particularly became a "phenomenon" in Paris: never before had a roman type been cut in so large a size. The designs copied Manutius's type even to the extent of copying the 'M' shown in "De Aetna" which, likely due to a casting defect, had no serif pointing out of the letter at top right. This form was to appear in many fonts of the period, including Garamond's earlier ones, although by the end of his career he had switched to mostly using an M on the Roman capital model with a serif at top right.