Developed with input from Brent ehrler and aaron martens. they have used several generations of this line to reach this product. Retains the suppleness of PE for stress free casting. Sleek finish to reduce guide friction and improved casting distance Neutral buoyancy. martens and ehrler both wanted a neutral buoyancy for optimum bait performance. Does not Use a Resin coating to compensate for fray or slickness, the raw fiber has been improved