Yo-Zuri TopKnot Mainline Fluorocarbon Fishing Line - 200yds The Yo-Zuri TopKnot MainLine-Natural Clear-is Abrasion Resistant and Super Durable which maintains its clarity even after extended use and allows the angler to get even more strikes on the same line. The most pressing feature, however, is the diameter to strength ratio. The TopKnot series offers the strongest possible breaking strength with an even smaller diameter than before. This is a must have product for any angler! Thin Diameter Superior Knot Strength Low Memory Abrasion Resistant