Seychelles Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Singapore was US$442 during 2013, according to the United Nations COMTRADE database on international trade. Seychelles Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Singapore - data, historical chart and statistics - was last updated on May of 2024.