"The quality of the copper, and how difficult the design is to build. Have a look at this picture.
https://www.google.com/search?q=cardas+cable&safe=off&biw=1600&bih=770&source=lnms&tbm=isch&sa=X&sqi=2&ved=0CAgQ_AUoA2oVChMIlbyxtZ3pyAIVhCQmCh0Wog-y#imgrc=R76Ojp5kqP3-qM%3A"
If we need to elucidate obvious aspects such as this then let's not waste our time on him.
https://www.google.com/search?q=cardas+cable&safe=off&biw=1600&bih=770&source=lnms&tbm=isch&sa=X&sqi=2&ved=0CAgQ_AUoA2oVChMIlbyxtZ3pyAIVhCQmCh0Wog-y#imgrc=R76Ojp5kqP3-qM%3A"
If we need to elucidate obvious aspects such as this then let's not waste our time on him.