Pro Sportfisher Flexineedle is an excellent tube tying tool. Pro Flexineedle is made of high carbon steel, is 120mm long and can be custom cut as desired from the back end. The needle features a flat conical tip that gradually tapers up and flattens on both sides of the taper. It is the taper combined with four corners that easily and quickly secures the tube for tying w/o slippage or spinning. Anything this good and under $20 bucks in the fly fishing industry is a must-have tool in your arsenal. Pro Flexineedle Specs Small 110mm length Fits Nano tube, microtube and 1,4mm classic tube Large: 120mm length Fits Nanotube, Microtube, Flexitube and classic tube 2,2mm perfectly XL (PREDATOR) 170mm length Fits the classic tube "PREDATOR". 1pc per package