Frodin Fits Tube System – the original Scandinavian tube system that changed tube fly tying world wide forever. The foundation of the system is the original coloured tubing that comes in four sizes. To balance the fly, to create different profiles and to fish at different depths we offer several types of cones and weighted tubes, all in three sizes. FITS is all you need to make any tube fly swim like nothing you’ve seen before. And remember – There’s only one original!