The BIONIC ICE FLUOROSILK is a do-it-all ice fishing line designed, engineered & tested by Team Northland. It has the invisibility and higher density of fluorocarbon along with the knot strength and Manageability of mono. This strong, dependable line has a co-polymer nylon core coating with an "invisible to fish" ultra-slick fluorocarbon coating. Available in 1,2,3,4,5,6 & 7 pound test diameters. Perfect for Bull Bluegills, Slab Crappies, Pound Perch and Wall Hangin' Walleyes.