Anglers Image Cast Connectors are small oblong plastic pieces with an opening at each end so that you can connect the fly line to the leader easily with a couple of overhand knots to each. The shape lends itself to pass through guidelines without snagging (unlike a knot sometimes can) and will not disrupt the cast, line mend, or dead drift. The less complicated knots are, the more time you can put flies on the water, and you can do so using Anglers Image Cast Connectors! Fly line to leader connection No need for complicated knots Efficient and fast leader changes Quantity per pack: 6