Perfect tube system for the modern style of salmon and seatrout flies. The Tubes are designed to fish your Tubefly with an absolute free swinging hook. Your fly will run absolutely straight and tangle free, plays much better and you will loose less fish. If you would like to fish with a smaller Swing-Tube you can cut the Swing-Tube to any length you like. 10mm 10 per pack. For hook sizes 8-12.