FLO Tips are a 10' spey tip with welded loops on both ends and are especially useful for skagit heads. The first 2.5 feet is intermediate density while the remaining 7.5 foot is sink material which comes available in T-7, T-10, T-14, and T-18. The T numbers represent grains of tungsten per foot so the bigger the number the heavier the tip is. The advantage of adding an intermediate section to the tip is first it smooths out your cast much better than just going from your floating head to a sink tip. The other advantage is they sink more evenly therefore keeping better contact with your fly. To use the FLO Tip just simply loop onto you skagit head and loop a piece of tippet of your choice to the other end.