A leader serves as an "invisible" separation between the fly line and the fly, and the fish. Invisible is good for fishing but for practice casting, a bright neon leader will give you a highly visual picture of the entire cast right down to the fly. The fluorescent orange leader is perfect for casting practice. It is ideal for fishermen wanting to visually see their practice casts whether on water or grass. Curve casts, reach casts, s-curves - now you can really see them and perfect them.