99.997% pure solid silver flat (low inductance) wire;
No real dielectric is used - at least, in the conventional sense: each of the silver ribbons is gently spiraled inside a flexible (but strong) transparent Helium filled 1/4 inches OD tubing (STEALTH para-vacuum technology*). The tubing touches only the very thin edges of the silver wire, and the flat part of the wire is surrounded by Helium only; each tube is strictly air tight to prevent Helium from leaking out and preserve the silver from oxidation.. When such construction is measured, the dielectric constant is very close to 1.0 - (vacuum) - and the closest up, solid Teflon, being 2.2 to 2.5 depending on the Teflon type (all other known solid dielectric have higher constants; the closer the dielectric constant to 1.0 - the better for the subjective "speed" perception).