Sunline Assasin FC Fluorocarbon is a 100% fluorocarbon line featuring Sunline'sproprietaryP-ion Technology. Assassin is the first product launched in the US featuring P-ion Technology. P-ion processing improves slickness, abrasion resistance and longevity of your line by chemically altering the line's surface to allow resin processing to bond at a molecular level. This processing increases line performance and allows the line to retain key characteristics longer and it's almost completely invisible in the water!