When you need a strong, durable fishing line that wont get chewed by toothy fish, cast with Tuf-Lines Tuf-Leader. The advanced T-304 extruded stainless steel leader with Spectra fiber core resists damage from abrasion and eliminates common issues associated with steel leader materials. Tri-component, 16-carrier braid construction with super-smooth exterior allows you to knot the leader cleanly with standard knots rather than using traditional crimping methods. Knots cinch down with little effort and stay in place. Made in USA. Lb. Test Monofilament Equivalent Diameter (lb. test) Dia. (in.) Spool Size (yds.)10 10 .010 5 15 15 .015 5 20 20 Type: Leader Materials.