These Euro Nymph Rollers are perfectly designed to add more movement to your flies as your dropper isn't 'fixed' in place as it would be if knotted directly to your leader. They also make changing droppers/rigs extremely easy as they can be made-up at home. Using one of our Euro Nymph Rollers will also reduce the number of breakages you have, the Roller is designed to move around your leader, and up/down to a stop knot, so droppers will be more forgiving on hard takes or double headers. These can be used for both river and lake fishing.