Yale PHD Spectra, 12 Strand, White with red tracer, 1/2". Ph.D. is different than any rope you've used or seen before. It feels like fuzzy polyester but performs like 100% Spectra0. Ph.D. securely grips in your hands and on winch surfaces to give you safe and deliberate handling, yet it glides through blocks like a dream, with virtually no stretch. This rope is oversized at rest but narrows down to spec size under load. Sold by the foot.