Lead, cadmium , chromium, cobalt and other heavy metals. In a zip lock bag and clearly marked "OIL PAINT, MAY CONTAIN TOXINS" with the list above and its weight. I hope they don't get smashed up by the TSA or Homeland Security, as did an unmarked wooden cigar box filled with hundreds of dollars worth of fine watercolor crayons and pencils. Smashed to BLITHERINES! Beyond utility and the sharpeners removed. But that was several years ago.