Dear Andrew,
I assure you a great thought and design goes into every Echo component, including material selection. As you see on our website we do extensive stress analysis on our component designs but any manufacturing process mistakes can happen, often out of our hands. In trial there is no right or wrong material as sport is always changing. We see carbon fibres used now and are looking into both plastic and ceramic materials for all components for future. I hope this one failure of Echo freewheel does not put you off our products in future.
Best,
Mr Deng