Refer to the input text as context and select the correct relationship between 'GrafTech' and 'graphite' from the available options.
Options: location of formation, member of, product/material produced, legal form

GrafTech our graphite electrode producer generated company EBITDA of $40 million this quarter, due to lower volumes and sale prices as the global economic slowdown has impacted demand for graphite electrodes.
product/material produced