Stylographic pens have a writing tip consisting of a metal tube with a fine wire inside to regulate ink flow. They were the first mass-produced fountain pens to achieve broad market success. They were invented by Duncan MacKinnon, who patented his "ink pencil" in Canada and Britain in 1875 and in the United States in 1876. Soon thereafter, AT Cross developed a slightly modified version of MacKinnon's pen, which was dubbed a "stylograph." From the early 1880s, the nibbed fountain pen overtook the stylographic pen. Stylos nonetheless remained a popular alternative until the advent of the ballpoint.