It is made of 24awg solid, pure bare copper conductors. Monoprice Ethernet cables are made of 100 percent pure bare copper wire, as opposed to copper clad aluminum (CCA) wire, and are therefore fully compliant with UL code 444 and National electrical code TIA-568-C.2 fire and safety standards. CMP (Plenum) fire safety rating. 350MHz bandwidth. 1000 foot roll.