Strangely there is magnetic attraction in the expanded diameter near the middle of the bar but not lateral to that mid-collar. Could it be an alloy bar reinforced with steel near the stem. Note i did check with the magnet lateral to the expanded area and there was no attraction i.e. the bar is alloy. I grabbed the bathroom scale and the bike as ready to ride measured 25 pounds, but hardly a precise measure. Sorry for the confusion about bar composition. The nonmagnetic sensitive part of the bar was covered with tape and only the central reinforced part was immediately accessible.