Performance handling. Delivered. Ph. D. line from Yale features a Spectra core sleeved with polyester fibers with Yale iGrip coating for the most secure grip. Comfortable, almost fuzzy hand feel makes it easier to grip. On winches it grips the surface securely so fewer wraps are needed with less slipping. Knots and hitches hold tightly even in high load applications. Ph. D. offers the softness and flexibility found in other Dyneema blended single braids combined with less elongation and improved durability. Extremely fast running through multiple purchase systems.