These rings are very small but very strong. Connect to the end of the leader and no longer will you have to reduce leader length when changing tippet. Ideal for use EURO Nymphing when targeting wild Trout and Grayling. strong. Connect to the end of the leader and no longer will you have to reduce the length of your leader when you’re changing tippet. These rings are ideal for use on the river when targeting grayling and wild trout.