The rings are manufactured utilising a high-grade, corrosion-resistant alloy. They pass through various manufacturing procedures and are then drum polished to ensure smoothness as well as maximum static friction, thereby guaranteeing the highest knot strength. Finally they are anodised, resulting in a grey black sheen that reflects very little light. The rings increase the braking strain of connections between two lines of up to 100%. The rings simplify changing leaders and avoid repeatedly shortening the main line. They are well suited for use in combination with dry-fly leaders; the rings are very light and are carried by the waters surface-tension. Also enclosed are mounting instructions, knot sketches and breaking strain table.