This 5 ft Canare L2.5CHD Ultra Slim 3G/HD SDI BNC Cable is a 75 Ω, 23 AWG coaxial cable for internal rack wiring. It features highly-foamed PE insulation that allows better attenuation because of the softness of the foaming. The insulation is made up of multiple layers at different foaming ratios to increase its durability. The shielding is tinned copper braid with aluminum foil, which provides better rejection of interference because of the solid composition of the foil.