The Sunline Tapered leader should be tied to your thick-weighted line used for casting on one end, and then tied to a piece of Tippet on the other side. Because leader line has a much finer diameter, nearby fish are unlikely to see your line and be scared away.
When fly fishing, you want the lightest line possible, but at the same time you need it to be strong and durable to avoid a fish busting you off. The Sunline Tapered leader is a great mix of these 2 factors. It has a 7-pound breaking strength which is ideal for both rainbow and brown trout.
Monofilament leader is a great choice because it floats on the water easier, and can absorb any sudden shocks caused by a fish taking off with your fly, because mono line stretches.
The Sunline Tapered leader pack comes with 3 pieces of leader that are 9-foot long.