Is this cable pure copper or copper clad aluminum?

I'm not REALLY sure but I think it's all copper. I not only have this cable stretched out the full 100 ft but have another 50 ft tack on to it and it works fine if that helps.

Questions & Answers: Coboc CY-CAT6-100-BK 100 ft. 550Mhz UTP Network Cable

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Item#: N82E16812422712
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Coboc CY-CAT6-100-BK 100ft. 24AWG Snagless Cat 6 Black Color 550MHz UTP Ethernet Stranded Copper Patch cord /Molded Network lan Cable

550MHz, Cat6,UTP
24AWG ,Tinned Stranded Copper
Molded,Snagless
50u" Gold Plated Contacts
100 ft,Black
ANSI/TIA-568B
cULus/ETL,CMH Rating

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