Singapore Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Bahrain was US$255 during 2010, according to the United Nations COMTRADE database on international trade. Singapore Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Bahrain - data, historical chart and statistics - was last updated on May of 2024.