What was the sole major product of cyleon

The correct answer to this open question is the following.

The dangers that the Phoenician traders may have encountered along their journeys were to navigate in harsh weather conditions, getting lost in the sea, shipwrecks, and running out of food and other needed supplies.

The Phoenicians were experts navigators and built good ships by their time that still impress historians. They established many sea routes along the Mediterranean Sea that were used mostly for trade purposes. They did not have much technology to navigate but were experts in following the stars.